2026秋小学数学二升三年级暑假专项提升训练20天（购物乘法应用题专题）

2026秋小学数学二升三年级暑假专项提升训练20天（购物乘法应用题专题）第1天基础入门：单一物品购物乘法应用题（表内乘法基础）核心知识点：单个商品单价固定，购买多件，总价=单价×数量，掌握最基础购物乘法应用，理解乘法在生活购物中的基本意义。1、一支铅笔3元，小明买4支铅笔，一共需要花多少钱？________________________________________________________________________________________________________________________________2、一块橡皮2元，买6块橡皮，总共需要支付多少元？________________________________________________________________________________________________________________________________3、一个作业本5元，小红买3个作业本，一共要花多少钱？________________________________________________________________________________________________________________________________4、一把尺子4元，购买7把尺子，总价是多少元？________________________________________________________________________________________________________________________________5、一个卷笔刀6元，买5个卷笔刀，需要花费多少钱？________________________________________________________________________________________________________________________________6、一支圆珠笔7元，买2支圆珠笔，一共多少元？________________________________________________________________________________________________________________________________7、一个文具盒8元，购买4个文具盒，总共需要多少钱？________________________________________________________________________________________________________________________________8、一个书签1元，买9个书签，一共花费多少元？________________________________________________________________________________________________________________________________9、一个笔记本9元，买3个笔记本，需要花多少钱？________________________________________________________________________________________________________________________________10、一个笔袋5元，买8个笔袋，总价是多少元？________________________________________________________________________________________________________________________________第2天基础巩固：数量拓展型购物乘法应用题核心知识点：拓展购买数量，熟练运用9以内表内乘法，巩固“单价×数量=总价”核心公式，提升基础运算熟练度。1、一瓶矿泉水2元，超市采购9瓶矿泉水，一共需要多少钱？________________________________________________________________________________________________________________________________2、一个面包4元，妈妈买8个面包当早餐，总共花费多少元？________________________________________________________________________________________________________________________________3、一包糖果6元，买7包糖果，一共要花多少钱？________________________________________________________________________________________________________________________________4、一瓶酸奶3元，购买9瓶酸奶，总价是多少元？________________________________________________________________________________________________________________________________5、一个发卡5元，买6个发卡，需要支付多少元？________________________________________________________________________________________________________________________________6、一把剪刀7元，文具店进货4把剪刀，一共花费多少钱？________________________________________________________________________________________________________________________________7、一个贴纸套装8元，买3套贴纸，总共多少元？________________________________________________________________________________________________________________________________8、一袋饼干9元，买5袋饼干，需要花多少钱？________________________________________________________________________________________________________________________________9、一个钥匙扣3元，买8个钥匙扣，总价是多少元？________________________________________________________________________________________________________________________________10、一块蛋糕6元，买9块蛋糕，一共需要多少钱？________________________________________________________________________________________________________________________________第3天题型升级：两种物品分开算乘法应用题核心知识点：区分两种不同单价商品，分别用乘法计算总价，初步接触分步解题，培养分类解题思维。1、铅笔每支3元，橡皮每块2元。小明买5支铅笔和4块橡皮，铅笔和橡皮各花多少钱？________________________________________________________________________________________________________________________________2、面包每个4元，酸奶每瓶3元。妈妈买6个面包和7瓶酸奶，分别花费多少元？________________________________________________________________________________________________________________________________3、笔记本每本5元，尺子每把4元。小红买4本笔记本和5把尺子，各花多少钱？________________________________________________________________________________________________________________________________4、文具盒每个8元，卷笔刀每个6元。买3个文具盒和6个卷笔刀，分别需要多少钱？________________________________________________________________________________________________________________________________5、圆珠笔每支7元，书签每个1元。买2支圆珠笔和9个书签，各花费多少元？________________________________________________________________________________________________________________________________6、饼干每袋9元，矿泉水每瓶2元。买3袋饼干和8瓶矿泉水，各花多少钱？________________________________________________________________________________________________________________________________7、蛋糕每块6元，糖果每包5元。买7块蛋糕和4包糖果，分别需要多少钱？________________________________________________________________________________________________________________________________8、笔袋每个5元，剪刀每把7元。买8个笔袋和3把剪刀，各花费多少元？________________________________________________________________________________________________________________________________9、贴纸每套8元，钥匙扣每个3元。买4套贴纸和6个钥匙扣，各花多少钱？________________________________________________________________________________________________________________________________10、作业本每本5元，橡皮每块2元。买9本作业本和5块橡皮，分别需要多少钱？________________________________________________________________________________________________________________________________第4天进阶题型：购物乘加综合应用题核心知识点：先乘法、后加法，计算两种购物商品的总花费，掌握乘加混合运算购物题型，贴合新课标综合应用要求。1、一支铅笔3元，一块橡皮2元。小明买5支铅笔和4块橡皮，一共需要花多少钱？________________________________________________________________________________________________________________________________2、一个面包4元，一瓶酸奶3元。妈妈买6个面包和7瓶酸奶，总共花费多少元？________________________________________________________________________________________________________________________________3、一本笔记本5元，一把尺子4元。小红买4本笔记本和5把尺子，一共花多少钱？________________________________________________________________________________________________________________________________4、一个文具盒8元，一个卷笔刀6元。买3个文具盒和6个卷笔刀，一共需要多少钱？________________________________________________________________________________________________________________________________5、一支圆珠笔7元，一个书签1元。买2支圆珠笔和9个书签，总共花费多少元？________________________________________________________________________________________________________________________________6、一袋饼干9元，一瓶矿泉水2元。买3袋饼干和8瓶矿泉水，一共花多少钱？________________________________________________________________________________________________________________________________7、一块蛋糕6元，一包糖果5元。买7块蛋糕和4包糖果，一共需要多少钱？________________________________________________________________________________________________________________________________8、一个笔袋5元，一把剪刀7元。买8个笔袋和3把剪刀，总共花费多少元？________________________________________________________________________________________________________________________________9、一套贴纸8元，一个钥匙扣3元。买4套贴纸和6个钥匙扣，一共花多少钱？________________________________________________________________________________________________________________________________10、一本作业本5元，一块橡皮2元。买9本作业本和5块橡皮，一共需要多少钱？________________________________________________________________________________________________________________________________第5天专项突破：购物乘减综合应用题核心知识点：先算购物总金额，再用减法计算找零、差价，掌握乘减混合购物题型，解决付款找零实际问题。1、一支铅笔3元，买6支铅笔，付给售货员20元，应该找回多少钱？________________________________________________________________________________________________________________________________2、一个面包4元，买5个面包，付了30元，找回多少元？________________________________________________________________________________________________________________________________3、一本笔记本5元，买7本笔记本，付给店员50元，应找回多少钱？________________________________________________________________________________________________________________________________4、一把尺子4元，买8把尺子，付40元，找回多少元？________________________________________________________________________________________________________________________________5、一个卷笔刀6元，买4个卷笔刀，付30元，应找回多少钱？________________________________________________________________________________________________________________________________6、一支圆珠笔7元，买3支圆珠笔，付25元，找回多少元？________________________________________________________________________________________________________________________________7、一个文具盒8元，买5个文具盒，付50元，应找回多少钱？________________________________________________________________________________________________________________________________8、一袋饼干9元，买4袋饼干，付40元，找回多少元？________________________________________________________________________________________________________________________________9、一块蛋糕6元，买8块蛋糕，付60元，应找回多少钱？________________________________________________________________________________________________________________________________10、一个笔袋5元，买9个笔袋，付50元，找回多少元？________________________________________________________________________________________________________________________________第6天综合入门：乘加找零复合购物应用题核心知识点：先乘加算出多种商品总价，再用减法计算找零，两步复合运算，提升综合解题能力。1、铅笔3元一支，橡皮2元一块，买4支铅笔和5块橡皮，付50元，找回多少钱？________________________________________________________________________________________________________________________________2、面包4元一个，酸奶3元一瓶，买5个面包和6瓶酸奶，付40元，应找回多少元？________________________________________________________________________________________________________________________________3、笔记本5元一本，尺子4元一把，买3本笔记本和7把尺子，付60元，找回多少钱？________________________________________________________________________________________________________________________________4、文具盒8元一个，卷笔刀6元一个，买2个文具盒和4个卷笔刀，付45元，应找回多少元？________________________________________________________________________________________________________________________________5、圆珠笔7元一支，书签1元一个，买3支圆珠笔和8个书签，付30元，找回多少钱？________________________________________________________________________________________________________________________________6、饼干9元一袋，矿泉水2元一瓶，买4袋饼干和9瓶矿泉水，付50元，应找回多少元？________________________________________________________________________________________________________________________________7、蛋糕6元一块，糖果5元一包，买5块蛋糕和3包糖果，付55元，找回多少钱？________________________________________________________________________________________________________________________________8、笔袋5元一个，剪刀7元一把，买6个笔袋和4把剪刀，付70元，应找回多少元？________________________________________________________________________________________________________________________________9、贴纸8元一套，钥匙扣3元一个，买3套贴纸和7个钥匙扣，付50元，找回多少钱？________________________________________________________________________________________________________________________________10、作业本5元一本，橡皮2元一块，买8本作业本和6块橡皮，付60元，应找回多少元？________________________________________________________________________________________________________________________________第7天题型拓展：多人购物乘法应用题核心知识点：结合多人购物场景，计算多人采购同款、不同款商品总价，拓展生活应用场景，强化乘法应用意识。1、每个同学买3本笔记本，班级有6名同学购买，一共需要买多少本笔记本？每本5元，总共花多少钱？________________________________________________________________________________________________________________________________2、小明、小红、小丽每人买4支铅笔，一支铅笔3元，三人买铅笔一共花费多少元？________________________________________________________________________________________________________________________________3、4个小朋友每人买2块蛋糕，一块蛋糕6元，小朋友们买蛋糕一共花多少钱？________________________________________________________________________________________________________________________________4、每组5名学生，共3组学生采购文具，每人买1个8元的文具盒，一共需要多少钱？________________________________________________________________________________________________________________________________5、爸爸、妈妈和小明每人买一瓶9元的饮料，一共需要支付多少元？________________________________________________________________________________________________________________________________6、6个同学每人买3块橡皮，一块橡皮2元，买橡皮总共花费多少钱？________________________________________________________________________________________________________________________________7、5名班干部每人采购4把尺子，一把尺子4元，采购尺子一共花多少钱？________________________________________________________________________________________________________________________________8、一家人4口人，每人买一个5元的钥匙扣，一共需要花多少钱？________________________________________________________________________________________________________________________________9、7个小伙伴每人买2袋饼干，一袋饼干9元，买饼干总共花费多少元？________________________________________________________________________________________________________________________________10、8名同学每人买3支圆珠笔，一支圆珠笔7元，一共需要多少钱？________________________________________________________________________________________________________________________________第8天难点突破：连乘购物应用题核心知识点：掌握两步连乘购物题型，理解“份数×每份数量×单价”解题逻辑，衔接三年级连乘运算考点。1、每盒有4支铅笔，每支铅笔3元，买5盒铅笔，一共需要多少钱？________________________________________________________________________________________________________________________________2、每袋有5块橡皮，每块橡皮2元，买6袋橡皮，总共花费多少元？________________________________________________________________________________________________________________________________3、每包有3本笔记本，每本笔记本5元，买7包笔记本，一共花多少钱？________________________________________________________________________________________________________________________________4、每盒有6把尺子，每把尺子4元，买4盒尺子，总价是多少元？________________________________________________________________________________________________________________________________5、每箱有8个面包，每个面包4元，买3箱面包，一共需要多少钱？________________________________________________________________________________________________________________________________6、每盒有2支圆珠笔，每支圆珠笔7元，买9盒圆珠笔，总共花费多少元？________________________________________________________________________________________________________________________________7、每袋有4个卷笔刀，每个卷笔刀6元，买5袋卷笔刀，一共花多少钱？________________________________________________________________________________________________________________________________8、每箱有7瓶酸奶，每瓶酸奶3元，买4箱酸奶，总价是多少元？________________________________________________________________________________________________________________________________9、每盒有3个文具盒，每个文具盒8元，买6盒文具盒，一共需要多少钱？________________________________________________________________________________________________________________________________10、每包有5袋饼干，每袋饼干9元，买2包饼干，总共花费多少元？________________________________________________________________________________________________________________________________第9天题型变式：单价翻倍/数量变式乘法应用题核心知识点：结合生活促销、规格变式场景，灵活运用乘法公式，打破固定题型思维，提升应变能力。1、普通铅笔3元一支，精装铅笔价格是普通铅笔的2倍，买4支精装铅笔需要多少钱？________________________________________________________________________________________________________________________________2、小面包4元一个，大面包价格是小面包的2倍，买5个大面包总共花费多少元？________________________________________________________________________________________________________________________________3、基础笔记本5元一本，加厚笔记本价格是它的2倍，买6本加厚笔记本需要多少钱？________________________________________________________________________________________________________________________________4、儿童尺子4元一把，成人尺子单价是儿童尺子的2倍，买3把成人尺子总价是多少元？________________________________________________________________________________________________________________________________5、普通卷笔刀6元一个，电动卷笔刀单价是它的3倍，买2个电动卷笔刀需要多少钱？________________________________________________________________________________________________________________________________6、平价圆珠笔7元一支，精品圆珠笔单价是它的2倍，买4支精品圆珠笔总共花费多少元？________________________________________________________________________________________________________________________________7、小号文具盒8元一个，大号文具盒单价是它的2倍，买5个大号文具盒需要多少钱？________________________________________________________________________________________________________________________________8、袋装饼干9元一袋，礼盒装饼干单价是它的3倍，买3盒礼盒饼干总价是多少元？________________________________________________________________________________________________________________________________9、小蛋糕6元一块，大蛋糕单价是它的4倍，买2块大蛋糕需要多少钱？________________________________________________________________________________________________________________________________10、普通笔袋5元一个，防水笔袋单价是它的2倍，买7个防水笔袋总共花费多少元？________________________________________________________________________________________________________________________________第10天中期综合测评：1-9天题型混合训练核心知识点：整合基础乘法、乘加、乘减、连乘、变式题型，全面检测前期学习效果，夯实基础。1、一把剪刀7元，买6把剪刀，一共需要花多少钱？________________________________________________________________________________________________________________________________2、贴纸每套8元，钥匙扣每个3元，买4套贴纸和5个钥匙扣，一共花费多少元？________________________________________________________________________________________________________________________________3、一袋饼干9元，买5袋饼干，付50元，应找回多少钱？________________________________________________________________________________________________________________________________4、每盒有3支圆珠笔，每支7元，买8盒圆珠笔，总共花多少钱？________________________________________________________________________________________________________________________________5、普通橡皮2元一块，创意橡皮单价是它的3倍，买4块创意橡皮需要多少钱？________________________________________________________________________________________________________________________________6、5名同学每人买3本作业本，每本5元，同学们买作业本一共花费多少元？________________________________________________________________________________________________________________________________7、面包4元一个，酸奶3元一瓶，买7个面包和4瓶酸奶，付40元，找回多少钱？________________________________________________________________________________________________________________________________8、每箱有6瓶矿泉水，每瓶2元，买7箱矿泉水，总价是多少元？________________________________________________________________________________________________________________________________9、小号卷笔刀6元一个，大号卷笔刀单价是它的2倍，买3个大号卷笔刀需要多少钱？________________________________________________________________________________________________________________________________10、笔记本5元一本，尺子4元一把，买9本笔记本和6把尺子，一共需要多少钱？________________________________________________________________________________________________________________________________第11天进阶新题型：购物比价省钱乘法应用题核心知识点：通过乘法计算不同购买方案总价，对比价格选择最优方案，培养数据分析与优化思维，贴合新课标应用素养。1、购买铅笔，单买3元一支，一盒6支装售价15元。买6支铅笔，单买划算还是整盒买划算？便宜多少钱？________________________________________________________________________________________________________________________________2、橡皮单块2元，一包5块装售价8元。买5块橡皮，哪种购买方式更省钱？省多少元？________________________________________________________________________________________________________________________________3、笔记本单本5元，一包4本装售价18元。买4本笔记本，哪种方式划算？便宜多少钱？________________________________________________________________________________________________________________________________4、尺子单把4元，一盒7把装售价25元。买7把尺子，单买和整盒买哪个省钱？省多少元？________________________________________________________________________________________________________________________________5、面包单个4元，一袋8个装售价28元。买8个面包，哪种购买方式更划算？便宜多少钱？________________________________________________________________________________________________________________________________6、圆珠笔单支7元，一盒3支装售价20元。买3支圆珠笔，哪种方式省钱？省多少元？________________________________________________________________________________________________________________________________7、卷笔刀单个6元，一袋4个装售价22元。买4个卷笔刀，哪种购买方式划算？便宜多少钱？________________________________________________________________________________________________________________________________8、酸奶单瓶3元，一箱9瓶装售价24元。买9瓶酸奶，单买和整箱买哪个省钱？省多少元？________________________________________________________________________________________________________________________________9、饼干单袋9元，一组5袋装售价40元。买5袋饼干，哪种方式更划算？便宜多少钱？________________________________________________________________________________________________________________________________10、蛋糕单块6元，一盒7块装售价38元。买7块蛋糕，哪种购买方式省钱？省多少元？________________________________________________________________________________________________________________________________第12天专项训练：带限额的购物乘法应用题核心知识点：计算购物总金额，对比带钱总额，判断钱够不够，掌握购物限额判断题型，提升实际应用能力。1、一支铅笔3元，买8支铅笔，小明带了25元，钱够吗？________________________________________________________________________________________________________________________________2、一块橡皮2元，买9块橡皮，小红带了20元，钱够不够？________________________________________________________________________________________________________________________________3、一本笔记本5元，买6本笔记本，妈妈带了35元，钱够吗？________________________________________________________________________________________________________________________________4、一把尺子4元，买7把尺子，带30元够不够？________________________________________________________________________________________________________________________________5、一个卷笔刀6元，买5个卷笔刀，带32元钱够吗？________________________________________________________________________________________________________________________________6、一支圆珠笔7元，买4支圆珠笔，带28元够不够？________________________________________________________________________________________________________________________________7、一个文具盒8元，买6个文具盒，带50元钱够吗？________________________________________________________________________________________________________________________________8、一袋饼干9元，买4袋饼干，带35元够不够？________________________________________________________________________________________________________________________________9、一块蛋糕6元，买8块蛋糕，带45元钱够吗？________________________________________________________________________________________________________________________________10、一个笔袋5元，买9个笔袋，带48元够不够？________________________________________________________________________________________________________________________________第13天综合进阶：多条件购物乘法应用题核心知识点：整合多种解题条件，结合乘加、限额判断、找零等多重考点，提升复杂情境解题能力。1、铅笔3元一支，尺子4元一把，买5支铅笔和4把尺子，一共花多少钱？带40元够吗？够的话找回多少元？________________________________________________________________________________________________________________________________2、面包4元一个，酸奶3元一瓶，买6个面包和5瓶酸奶，总花费多少元？付50元，找回多少钱？________________________________________________________________________________________________________________________________3、笔记本5元一本，橡皮2元一块，买7本笔记本和8块橡皮，一共多少钱？带60元够不够？________________________________________________________________________________________________________________________________4、文具盒8元一个，卷笔刀6元一个，买3个文具盒和5个卷笔刀，总花费多少？付45元够吗？________________________________________________________________________________________________________________________________5、圆珠笔7元一支，书签1元一个，买4支圆珠笔和9个书签，一共花多少钱？付35元找回多少？________________________________________________________________________________________________________________________________6、饼干9元一袋，矿泉水2元一瓶，买3袋饼干和7瓶矿泉水，总花费多少？带40元够不够？________________________________________________________________________________________________________________________________7、蛋糕6元一块，糖果5元一包，买8块蛋糕和4包糖果，一共多少钱？付70元找回多少？________________________________________________________________________________________________________________________________8、笔袋5元一个，剪刀7元一把，买6个笔袋和3把剪刀，总花费多少？带55元够不够？________________________________________________________________________________________________________________________________9、贴纸8元一套，钥匙扣3元一个，买5套贴纸和6个钥匙扣，一共花多少钱？付60元找回多少？________________________________________________________________________________________________________________________________10、作业本5元一本，尺子4元一把，买8本作业本和7把尺子，总花费多少？带75元够不够？________________________________________________________________________________________________________________________________第14天难点强化：三步购物复合乘法应用题核心知识点：三步运算购物题型，先算变式单价、再算总价、最后算差价/找零，完全衔接三年级重难点。1、精装铅笔单价是普通铅笔的2倍，普通铅笔3元一支，买6支精装铅笔，付40元，找回多少钱？________________________________________________________________________________________________________________________________2、大号面包单价是小面包的2倍，小面包4元一个，买7个大号面包，付60元，应找回多少元？________________________________________________________________________________________________________________________________3、加厚笔记本单价5元，精装笔记本是它的2倍，买5本精装笔记本和3本普通笔记本，一共花多少钱？________________________________________________________________________________________________________________________________4、成人尺子单价是儿童尺子的2倍，儿童尺子4元一把，买4把成人尺子和5把儿童尺子，总花费多少？________________________________________________________________________________________________________________________________5、电动卷笔刀单价是普通卷笔刀的3倍，普通卷笔刀6元一个，买3个电动卷笔刀，付70元找回多少？________________________________________________________________________________________________________________________________6、精品圆珠笔单价是普通圆珠笔的2倍，普通圆珠笔7元一支，买4支精品笔和2支普通笔，一共多少钱？________________________________________________________________________________________________________________________________7、大号文具盒单价是小号的2倍，小号8元一个，买4个大号文具盒，付80元应找回多少元？________________________________________________________________________________________________________________________________8、礼盒饼干单价是袋装的3倍，袋装9元一袋，买2盒礼盒饼干和4袋袋装饼干，总花费多少？________________________________________________________________________________________________________________________________9、大蛋糕单价是小蛋糕的4倍，小蛋糕6元一块，买2块大蛋糕和6块小蛋糕，一共多少钱？________________________________________________________________________________________________________________________________10、防水笔袋单价是普通笔袋的2倍，普通笔袋5元一个，买6个防水笔袋，付70元找回多少？________________________________________________________________________________________________________________________________第15天专项突破：连乘找零购物应用题核心知识点：连乘算出批量购物总价，再计算找零，攻克三年级高频难点题型，强化分步运算能力。1、每盒4支铅笔，每支3元，买5盒铅笔，付70元，应找回多少钱？________________________________________________________________________________________________________________________________2、每袋5块橡皮，每块2元，买6袋橡皮，付65元，找回多少元？________________________________________________________________________________________________________________________________3、每包3本笔记本，每本5元，买7包笔记本，付110元，应找回多少钱？________________________________________________________________________________________________________________________________4、每盒6把尺子，每把4元，买4盒尺子，付100元，找回多少元？________________________________________________________________________________________________________________________________5、每箱8个面包，每个4元，买3箱面包，付100元，应找回多少钱？________________________________________________________________________________________________________________________________6、每盒2支圆珠笔，每支7元，买9盒圆珠笔，付130元，找回多少元？________________________________________________________________________________________________________________________________7、每袋4个卷笔刀，每个6元，买5袋卷笔刀，付120元，应找回多少钱？________________________________________________________________________________________________________________________________8、每箱7瓶酸奶，每瓶3元，买4箱酸奶，付90元，找回多少元？________________________________________________________________________________________________________________________________9、每盒3个文具盒，每个8元，买6盒文具盒，付150元，应找回多少钱？________________________________________________________________________________________________________________________________10、每包5袋饼干，每袋9元，买2包饼干，付100元，找回多少元？________________________________________________________________________________________________________________________________第16天综合拔高：促销优惠乘法购物应用题核心知识点：结合买赠、优惠促销生活场景，计算实际购物总价，贴合新课标生活化应用要求，衔接三年级奥数基础题型。1、文具店促销：买4送1，铅笔每支3元，小明买4支铅笔，实际得到5支，每支实际便宜多少钱？一共花多少钱？________________________________________________________________________________________________________________________________2、超市促销：买5块橡皮送1块，橡皮每块2元，买5块橡皮，实际得到6块，总花费多少元？________________________________________________________________________________________________________________________________3、笔记本买3送1，每本5元，小红买3本笔记本，实际得到4本，一共需要花多少钱？________________________________________________________________________________________________________________________________4、尺子买6送1，每把4元，买6把尺子，实际得到7把，总花费多少元？________________________________________________________________________________________________________________________________5、面包买7送1，每个4元，买7个面包，实际得到8个，一共花多少钱？________________________________________________________________________________________________________________________________6、圆珠笔买2送1，每支7元，买2支圆珠笔，实际得到3支，总花费多少元？________________________________________________________________________________________________________________________________7、卷笔刀买4送1，每个6元，买4个卷笔刀，实际得到5个，一共需要花多少钱？________________________________________________________________________________________________________________________________8、酸奶买8送1，每瓶3元，买8瓶酸奶，实际得到9瓶，总花费多少元？________________________________________________________________________________________________________________________________9、饼干买4送1，每袋9元，买4袋饼干，实际得到5袋，一共花多少钱？____________________________________________________________________________________________________