自主学习数学九下答案

书书书自主学习指导课程G21G22ZHIDAOKECHENG誗誗数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学誗誗参考答案第一部分G22基础知识一G22有理数自主探究誗自主学习G21G23G24G25G26米G22G27G23G28G22G29G23G21G2AG21G27G21G24G27G22G2BG23G28G22G2AG23G2CG22G25G23G24G29誗自我尝试G2DG23G28G22G2EG23G2FG22G30G23G2FG22G21G26G23甲G22丙G22G21G21G23G24G2AG22G21G27G23G2DG21G21G22G21G29G23G21G2D开放作业G21G2BG23G28G22G21G2AG23G24G27G22G21G25G23G23G21G24 G24G21G2B G30G2EG2AG25G23G27G24G30G30 G30G26G26G22G21G2DG23G21G2EG21G25G2DG26拓展学习G21G2EG23G23G27G24G21G31G24G29G26G21G22G31G24G27二G22实数自主探究誗自主学习G21G23G23G21G24 G32G27G21G24G29G21G2BG21G24G2BG21G27G21G27G22G23G27G24 G33G21G27G22G23G29G24G21G21G2BG22G27G23G23G21G24G28G22G23G27G24G28G22G23G29G24G34誗自我尝试G29G23G23G21G24G29G2BG21 G24G21G2BG22G23G27G24槡G29 G24G27G21槡G27 G24G29G21槡G2D G24G2B G29G22G23G29G24槡G27G21槡G24G27G22G23G2BG24 G23 G24G2DG24槡G27G21 G24G21G23G2BG2BG21G29槡G27G2DG21G27G27G2DG25槡G24G29G21槡G27 G24G21G21G21G27G21G21G26G23G29G21G29 G21G21G29 G21G21G21 G29G26G25 G23 G24G2DG24槡G27G21G29槡G27G2DG2BG23G23G21G24G2FG22G23G27G24G35G22G23G29G24G28G2AG23G23G21G24G21G22G23G27G24槡G27 G27G22G25G23略G22G2DG23丙开放作业G2EG23G27G21槡G21G36G2AG22G30G23G24G27G23G22G21G26G23G21G22G21G21G37G2DG22G21G27G23G2EG21拓展学习G21G29G23解G27G23G21G24G23 G24G27G24G22G29 G31G24G27G38G23 G24G27G24G29G24 G36G21G31G24G27G38G23 G24G2AG24 G36G21G31G21G26G36G21G31G21G21G24G23G27G24G39G29G22G22G33G21G29G21G3AG29G23G29G24G22G24 G36G21G33G21G29G24G30G24G29G22G36G21G33G21G29G24G24G29G22G33G29G24G22G2CG24G21G24G27G22自主学习指导课程ZHIDAOKECHENG誗誗数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学誗誗数轴表示如图G21所示誗图G21三G22二次根式自主探究誗自主学习G21G23G22G23G27G22G27G23G35G22G29G23G35G22G2BG23G2FG22G2AG23G27G2A誗自我尝试G25G23G28G22G2DG23G29G22G2EG23G24G30G22G30G23G23G21G24槡G29G22G23G27G24G29G22G23G29G24槡G25 G2AG22G23G2BG24槡G29G2AG24G27G26 G29G22G21G26G23G23G21G21G23原式G31G25G27G31G29G22G21G27G23原式G31G23G25G24G21G24G27G36G23G27G31G2D开放作业槡G21G29G23G34G22G21G2BG23G2A G27G3BG3C誗G27G26G30槡G2DG3BG3CG22G21G2AG23G23G21G24G21G27G22G23G27G24槡槡G2B G29G22G21G25G23G21G25G24G25 G21G26G22G21G2DG23G35拓展学习G21G2EG23G23G21G24G25G31G26G27G36G29G27G27誗G23G31G27G26G27G22G23G27G24略G22G23G29G24G25G31G21G29或G25G31G2D四G22整式的加减自主探究誗自主学习G21G23G24G29G2B誗G25G22G27G23五誗四誗G24G21G22G29G23G35G22G2BG23G34G22G2AG23G28誗自我尝试G25G23G23G21G24G28G22G23G27G24G34G22G23G29G24G2FG22G2DG23G23G21G24G21G25G2EG22G21G29G22G23G27G24G21G2AG23G25G24G23G22G23G29G24G30G38G25G36G2AG31G2AG30誗G30G27G36G23G27G24G21G24 G31G21G26G27G24G21G23G2BG24G22G21G29G22G23G29G27G36G21G22G2EG23G23G21G24 G24G2BG22G27G36G22G36G29G22G23G27G24G22G27G36G29G22G21G24G29G27G22G22G30G23原式G31G24G2AG22G21G27G36G22G21G31G24G27G27G21G26G23G29G21誗G29G27G36G21开放作业G21G21G23G23G21G24G29G22G29G24G2AG22G27G36G25G22G24G30G22G23G27G24G27G21誗G24G30G22G23G29G24G25G2DG27G30G22G21G27G23G23G21G24G2FG22G23G27G24G2FG22G21G29G23G25G31G27G2AG22G21G2BG23G21G26G26G3BG3C拓展学习G21G2AG23G2BG29G2A五G22整式的乘除自主探究誗自主学习G21G23G23G21G24G25G2DG22G23G27G24G25G25G22G23G29G24G25G2AG23G2AG22G23G2BG24G21誗G26G22G23G2AG24G25G2BG22G27G23G23G21G24G2FG22G23G27G24G2FG22G23G29G24G34誗自我尝试G29G23G23G21G24G21G30G2D誗G21G22G23G27G24G25G2BG22G23G29G24 G32G25G22G22G23G2BG24 G32G25G22G23G2AG24G23G24G2BG23G23G21G24G34G22G23G27G24G28G22G23G29G24G34G22G23G2BG24G2F自主学习指导课程G29G22ZHIDAOKECHENG誗誗数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学誗誗G2AG23誗G21G24 G24G25G2AG23G2AG28G2AG24G25G25G23G25G28G25G22誗G27G24原式G31G22G24G21G31G2BG25G23原式G31G30G22G21G21当G22槡G31G27 G36G21G21G21槡G31G27 G24G21时G21原式G31G30G23开放作业G2DG23G2BG2DG22G2EG23G29G2BG21G21G2AG22G30G23G25G36G29G23G22G21G26G23G29G21誗G27G26G36G27G24G27G22G21G21G23G25槡G31G2A G24G27G21G25G27G36G2BG25G31G21G22G21G27G23G2BG21G25G21G2B拓展学习G21G29G23誗G21G24原式G31誗G27G24G21G24誗G27G25G36G27G2AG36G27G2BG36G27G29G36G27G27G36G27G36G21G24 G31G27G2DG24G21G31G21G27G2D誗G27G24G22G27G36G21G24G21G22誗G29G24G21六G22因式分解自主探究誗自主学习G21G23誗G21G24G22G25誗G25G36G23G24G22G23誗G22G36G29G24誗G22G24G29G24G22G24G27誗G22G24G29G24G27G22誗G27G24G2E或G24G27G27G23誗G21G24G28G22誗G27G24G28G22誗G29G24G34誗自我尝试G29G23G28G22G2BG23G2FG22G2AG23G35G22G25G23G2BG22G2DG23G21G27G22G2EG23G26G22G30G23G30 G2EG26G21G21G29 G30G30G30 G30G30G25G21G21G25G21G26G23誗G21G24 G24誗G22G24G21G24G27G22誗G27G24誗G25G36G29G24G27G22誗G29G24誗G22G36G21G24G2AG24G27誗G2BG24誗G22G36G27G24G27誗G22G24G27G24G27G22誗G2AG24G2A誗G22G24G21G24誗G27G25G22G24G27G25G21G36G23G24G22誗G25G24 G24G27G22G21誗G22G36G21G24开放作业G21G21G24G35G22G21G27G23G24G21G21G22G21G29G37G24G21G26G22G21G2BG37G2DG2AG22G21G2AG23G28G21G25G23G24G2AG2B拓展学习G21G2DG23誗G21G24 G32G21G21G32G2DG22誗G27G24有G21G29七G22分式与分式方程自主探究誗自主学习G21G23G24G29G22G27G23G24G29G22G29G23G21G27G22G29G21G2AG22G2BG23G29G22G2AG23G35G22G25G23G35G22G2DG23G28G2EG23誗G21G24G22G31G21G22誗G27G24G22G31G29誗自我尝试G30G23G2DG2AG22G21G26G23G26G33G21G33G27G22G21G21G23G26G2CG24G25且G26G24G24G2BG21G27G23G34G21G29G23誗G21G24G25G36G27G25G22誗G27G24G21G2B誗G21G36G29G24G21G2BG23誗G21G24G22G31G24G25G22誗G27G24G22G31G27G22G21G2AG23G27G26G26千克G21G25G23解G27设引入新设备前工程队每天改造管道G22米G21由题意得G21G29G25G26G22G36G30G26G26G24G29G25G26G21G23G27G22G31G27G2DG21解得G22G31G29G26G23经检验G21G22G31G29G26是原方程的解G21且符合题意G23G2BG22自主学习指导课程ZHIDAOKECHENG誗誗数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学誗誗答誗引入新设备前工程队每天改造管道G29G26米G23开放作业槡G21G2DG23G34G22G21G2EG23G24G27G22G21G30G23G27G2BG22G27G26G23G23G21G24G27G38G27G27G36G21G31G27G24G27G27G36G21G23G27G24证誗右边G31G27G27G36G27G24G27G27G36G21G31G27G27G27G36G21G31左边G21即誗G27G38G27G27G36G21G31G27G24G27G27G36G21拓展学习G27G21G23解誗G23G21G24分式方程去分母得誗G26G24G21G24G22G31G26G21由题意将G22G31G21代入得誗G26G24G21G24G21G31G26G21即G26G31G27G25将G26G31G27代入方程得誗G2BG36G27G2BG36G25G31G26G21即G2BG31G24G2AG24G23G27G24方程另一根为G29G24八G22一元一次方程自主探究誗自主学习G21G23G27G30G21G29G21G21G29G29G22G27G23G35G22G29G23G35G22G2BG23G28G22G2AG37G23G21G24G22G31G24G27G26G22G23G27G24G22G31G24G30G27G2E誗自我尝试G25G23G29G2EG22G2DG23G2FG22G2EG23G35G22G30G23G2FG21G26G23G23G21G24G29G2BG22G23G27G24G21开放作业G21G21G23G29G22G21G27G23G28G31G25G36G2AG21G2AG22G21G29G23G28G22G21G2BG23G28G22G21G2AG23G29G29G21G25G23G23G26G23G2AG2BG24G26G23G26G26G27G27G24G21G2DG23解誗G23G21G24设甲车单独运完此堆垃圾需运G22趟G21则乙车单独运完此堆垃圾需运G27G22趟G21根据题意得出誗G21G22G36G21G27G22G31G21G21G27G23解得誗G22G31G21G2EG21则G27G22G31G29G25G21经检验得出誗G22G31G21G2E是原方程的解G21答誗甲车单独运完需G21G2E趟G21乙车单独运完需G29G25趟G25G23G27G24设甲车每一趟的运费是G25元G21由题意得誗G21G27G25G36G21G27G23G25G24G27G26G26G24 G31G2B G2EG26G26G21解得誗G25G31G29G26G26G23则乙车每一趟的费用是誗G29G26G26G24G27G26G26G31G21G26G26G23元G24G21单独租用甲车总费用是誗G21G2EG38G29G26G26G31G2A G2BG26G26G23元G24G21单独租用乙车总费用是誗G29G25G38G21G26G26G31G29 G25G26G26G23元G24G21G29 G25G26G26G33G2A G2BG26G26G21故单独租用一辆车G21租用乙车合算G23拓展学习G21G2EG23解G23G21G24由题意G21裁剪时G22张用G2F方法G21裁剪时G23G21G30G24G22G24张用G35方法G37G3A侧面的个数为G25G22G36G2BG23G21G30G24G22G24 G31G23G27G22G36G2DG25G24个G21底面的个数为G2AG23G21G30G24G22G24 G31G23G30G2AG24G2AG22G24个G24G23G27G24由题意得G27G22G36G2DG25G29G31G30G2AG24G2AG22G27G21解得G22G31G2DG24G3A能做盒子G27G38G2DG36G2DG25G29G31G29G26G23个G24G24自主学习指导课程G2AG22ZHIDAOKECHENG誗誗数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学誗誗九G22二元一次方程组自主探究誗自主学习G21G23G29G27G22G36G27G22G27G23G34G22G29G23G26G22G2BG23G2FG22G2AG23誗G21G24G22G31G29G21G21G31G25G22誗G27G24G22G31G29G21G21G31G21G27誗自我尝试G25G23G22G31G26G21G21G31G2BG21G22G22G31G29G21G21G31G27G21G22G22G31G25G21G21G31G26G2DG23G28G22G2EG23G2FG22G30G23G34G22G21G26G23G28G22G21G21G23G2FG21G27G23黑色文化衫G25G26件G21白色文化衫G2EG26件G23开放作业G21G29G23G35G22G21G2BG23G35G21G2AG23略解G27誗G21G24装运乙种水果的车有G27辆G22丙种水果的汽车有G25辆G25誗G27G24装运乙种水果的汽车是誗G26G24G21G27G24辆G21丙种水果的汽车是誗G29G27G24G27G26G24辆G25誗G29G24利润G2CG31G27G26G26G36G21G2B誗G26G24G21G27G24 G36G21G27誗G29G27G24G27G26G24 G31G21G26G26G36G27G21G25G23由G26G23G21G21G26G24G21G27G23G21G21G29G27G24G27G26G23G21得G21G29G25G26G25G21G2AG23G2AG21所以G26可以取G21G29G21G21G2BG21G21G2A三个值G21由于一次函数G2CG31G21G26G26G36G27G21G25中G2C随G26的增大而增大G21所以G26G31G21G2A时利润最大G23当运甲水果的车G21G2A辆G21运乙水果的车G29辆G21运丙水果的车G27辆G21利润最大G21最大利润为G29G25G23G25万元G23拓展学习G21G25G23解G27誗G21G24如图所示G27四边形时G21G2DG31G21G21五边形时G21G2DG31G2AG23誗G27G24将G27G31G2BG21G2EG31G21G25G27G31G2AG21G2EG31G2A代入关系式G21得G2B誗G2BG24G21G24G27G2B誗G2BG27G24G25G38G2BG36G23G24 G31G21G21G2A誗G2AG24G21G24G27G2B誗G2AG27G24G25G38G2AG36G23G24 G31G2AG21整理G21得G2BG25G24G23G31G21G2BG21G2AG25G24G23G31G21G30G21解得G25G31G2AG21G23G31G25G24十G22一元一次不等式G21组G22自主探究誗自主学习G21G23誗G21G24 G2CG22誗G27G24 G33G22誗G29G24 G2CG22G27G23G26G21G21G22G29G23G22G23G21G29G22G2BG23G34G22G2AG23G35G22G25G23G25G2CG21G2DG23誗G21G24G21G25G22G33G25G22 G22誗G27G24G27G33G22G33G2BG2EG23解G27设小宏能买G22瓶甲饮料G21则买乙饮料誗G21G26G24G22G24瓶G23根据题意G21得G2DG22G36G2B誗G21G26G24G22G24G25G2AG26G21解得G22G25G29G21G29G23所以小宏最多能买G29瓶甲饮料G23誗自我尝试G25G22自主学习指导课程ZHIDAOKECHENG誗誗数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学誗誗G30G23G2BG2CG21G29G22G21G26G23G22G33G2AG25G24G27G22G21G21G23G22G23G24G22G21G27G23G2BG2CG27G22G21G29G23G35G21G2BG23这个不等式组的解集是G24G2BG25G22G33G29誗它的整数解为G24G2B誗 G24G29誗 G24G27誗 G24G21誗G26誗G21誗G27G23G3A这个不等式组的整数解的和是G24G2BG24G29G24G27G24G21G36G26G36G21G36G27G31G24G2DG23开放作业G21G2AG23G22G2CG21G22G21G25G23G29G29G22G21G2DG23G2FG22G21G2EG23G2FG21G30G23解G27设这个班至少要胜G22场誗则负G23G27G2EG24G22G24场誗由题意得誗G29G22G36G27G2EG24G22G23G2BG29誗解得G22G23G21G2AG27G23G39G22取最小的整数誗G3AG22G31G2EG23答G27这个班至少要胜G2E场G23拓展学习G27G26G23解G27G23G21G24设每本文学名著G22元誗动漫书G21元誗根据题意誗得G27G26G22G36G2BG26G21G31G21 G2AG27G26誗G27G26G22G31G27G26G21G36G2BG2BG26誗解得G22G31G2BG26誗G21G31G21G2EG23答G27每本文学名著G2BG26元誗动漫书G21G2E元G23G23G27G24设学校要求购买文学书G25本誗则动漫书G23G25G36G27G26G24本誗根据题意誗得G25G36G27G26G36G25G23G2DG27誗G2BG26G25G36G21G2EG23G25G36G27G26G24G25G27 G26G26G26G23解得G27G25G25G25G25G27G2EG2EG27G30G23因为G25为整数誗所以G25G31G27G25誗G27G2D誗G27G2EG23有三种方案G27方案一G27文学书G27G25本誗动漫书G2BG25本G25方案二G27文学书G27G2D本誗动漫书G2BG2D本G25方案三G27文学书G27G2E本誗动漫书G2BG2E本G23十一G22一元二次方程G21第一课时G22自主探究誗自主学习G21G23G23G21G24G23G27G24G22G27G23G2AG22G29G23G25G22G27G36G21G26G22G24G2AG31G26誗G25誗G21G26誗G24G2AG22G2BG23G22G21G31G26誗G22G27G31G24G29G22G2AG23G22G21G31G2A誗G22G27G31G24G27G22G25G23G29G27誗G24G21G27G22G2DG23G29G22G2EG23G2FG22G30G23G2F誗自我尝试G21G26G23G22G23G22G24G21G24 G31G27 G2AG2AG26G22G21G21G23G25G3BG3C誗G2EG3BG3CG22G21G27G23G23G21G24G22G21槡G31G21G36G27G27誗G22G27槡G31G21G24G27G27G22G23G27G24G22G21G31槡G27G36 G21G26G29誗G22G27G31槡G27G24 G21G26G29G22G23G29G24G22G21G31G21G29誗G22G27G31G24G21G22G23G2BG24G22G21G31G24G21G29G2A誗G22G27G31G24G21G21G29G23G23G21G24G22G21槡G31G29G36 G21G21誗G22G27槡G31G29G24 G21G21G22G23G27G24G22G21G31G29誗G22G27G31G21G27G22G23G29G24G22G21G31G21誗G22G27G31G24G27G29G22G23G2BG24G22G21G31G26誗G22G27G31G27G21G2BG23解G27能折成一个面积为G29G26G3BG3CG27的矩形G24理由是G27设矩形一边长为G22G3BG3C誗则另一边长为G23G21G21G24G22G24G3BG3CG23G22G22G23G21G21G24G22G24 G31G29G26誗解得G22G21G31G2A誗G22G27G31G25G23当G22G31G2A时誗G21G21G24G22G31G25誗当G22G31G25时誗G21G21G24G22G31G2AG23答G27能折成面积为G29G26G3BG3CG27的矩形誗矩形的两条边长分别是G2AG3BG3C誗G25G3BG3CG23G23不能折成一个面积为G29G27G3BG3CG27的矩形G24理由是G27G22G23G21G21G24G22G24 G31G29G27誗整理誗得G22G27G24G21G21G22G36G29G27G31G26G23G39G23G27G24G2BG25G28G31G21G27G21G24G21G27G2EG33G26誗G3A方程无解G23自主学习指导课程G2DG22ZHIDAOKECHENG誗誗数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学誗誗G3A不能折成面积为G29G27G3BG3CG27的矩形G23G21G2AG23解誗设应邀请G22支球队参赛G21根据题意G21可列出方程G22G23G22G24G21G24G27G31G27G2EG23解这个方程G21得G22G21G31G2EG21G22G27G31G24G2DG23舍去G24G23答誗应邀请G2E支球队参加比赛G24开放作业G21G25G23G30G22G21G2DG23G27G26G2FG22G21G2EG23G22G21G31G21G29G21G22G27G31G24G27G22G23G27G24G22G21G31G24G29G21G22G27G31G24G29G27G22G23G29G24G22G21G31G24G25G21G22G27G31G27G22G23G2BG24G22G21G31G2AG29G21G22G27G31G27G22G21G30G23G30G23G21G2AG3CG21G27G26G3CG27G26G23解誗设矩形温室的宽为G22G3CG21则长为G27G22G3CG21根据题意G21得G23G22G24G27G24G23G27G22G24G2BG24 G31G27G2EG2EG21解这个方程G21得G22G21G31G24G21G26G23不合题意G21舍去G24G21G22G27G31G21G2BG21G3AG22G31G21G2BG21G27G22G31G27G38G21G2BG31G27G2EG23拓展学习G27G21G23解誗设这种玩具的销售单价为G22元时G21厂家每天可获利润G27G26 G26G26G26元G21由题意得G21G23G22G24G29G25G26G24G28G21G25G26G36G27G23G2BG2EG26G24G22G24G29 G31G27G26 G26G26G26整理G21得G22G27G24G30G27G26G22G36G27G21G21 G25G26G26G31G26G21解得G22G21G31G22G27G31G2BG25G26G3A这种玩具的销售单价为G2BG25G26元时G21厂家每天可获利润G27G26 G26G26G26元G23十一G22一元二次方程G21第二课时G22自主探究誗自主学习G21G24G24G2BG22G27G23G29G27G21G24G21G27G22G29G23G2BG25G2B且G2BG24G26G22G2BG23G26G25G29且G26G24G27G22G2AG23G29G21G24G27G22G25G23G27G22G2DG23G2BG22G2EG23G25或G24G25G22G30G23G28G22G21G26G23G2FG22G21G21G23G35G22G21G27G23G34誗自我尝试G21G29G23解誗G23G21G24G39G26是方程G22G27G24G22G24G27G31G26的根G21G3AG26G27G24G26G24G27G31G26G21G26G27G24G27G31G26G23G3A原式G31G23G26G27G24G26G24G23G26G27G24G27G26G36G21G24 G31G27G38G23G26G26G36G21G24 G31G2BG23G21G2BG23G23G21G24G39G21G31G23G26G36G21G24G27G36G2BG21无论G26取任何实数G21G23G26G36G21G24G27G23G26G21G3AG21G31G23G26G36G21G24G27G36G2BG2CG26G23G3A原方程有两个不相等的实数根G23G23G27G24由根与系数关系G21得G22G21G36G22G27G31G24G23G26G36G29G24G21G22G21G2AG22G27G31G26G36G21G21G39G3DG22G21G24G22G27槡G3DG31G27 G27G21G3AG23G22G21G24G22G27G24G27G31G2EG21即G23G22G21G36G22G27G24G27G24G2BG22G21G22G27G31G2EG21得G23G26G36G21G24G27G31G2BG21解得G21G26G21G31G21G21G26G27G31G24G29G23G3AG22G21槡G31G27G21G22G27槡G31G24G27或G22G21槡G31G24G27G36G27G21G22G27槡G31G24G27G24G27G23开放作业G21G2AG23G28G22G21G25G23G35G22G21G2DG23G28G22G21G2EG23G30G21G30G23证明誗G23G21G24G39G21G31G28 G24G23G2BG36G29G24G29G27G24G2BG23G27G2BG36G27G24 G31G2BG27G24G27G2BG36G21G31G23G2BG24G21G24G27G23G26G21G3A方程总有两个实数根G23G23G27G24G39G22G27G24G23G2BG36G29G24G22G36G27G2BG36G27G31G23G22G24G27G24G23G22G24G2BG24G21G24 G31G26G21G3AG22G21G31G27G21G22G27G31G2BG36G21G23G39方程总有一根小于G21G21G3AG2BG36G21G33G21G23G3AG2BG33G26G23即G2B的取值范围为誗G2BG33G26G23拓展学习G27G26解誗G23G21G24由题意可知誗花圃的面积为G23G25G26G24G27G25G24G23G2BG26G24G27G25G24 G31G2BG25G27G24G27G26G26G25G36G27 G2BG26G26G25G23G27G24通道的面积为G25G26G38G2BG26G24G23G2BG25G27G24G27G26G26G25G36G27 G2BG26G26G24 G31G24G2BG25G27G36G27G26G26G21则誗G24G2BG25G27G36G27G26G26G25G31G29G2EG38G27 G2BG26G26G21G3AG2BG25G27G24G27G26G26G25G36G30G26G26G31G26G23解得誗G25G31G2AG21G25G31G2BG2AG23舍去G24G23G2EG22自主学习指导课程ZHIDAOKECHENG誗誗数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学誗誗G3A通道的宽为G2A米G23誗G29G24设修建的通道和花圃的总造价为G21元G23由图可知G27G21G21G31G2BG26G22G21G21G27G31G25G26G22誗G26G25G22G25G2EG26G26G24G21G29G2AG22G36G27G26 G26G26G26誗G22G2CG2EG26G26G24G23再设花圃的面积为G23G3CG27G21则通道的面积为誗G27 G2BG26G26G24G23G24G3CG27G21G3AG23G31G2BG25G27G24G27G26G26G25G36G27 G2BG26G26G31G2B誗G25G24G27G2AG24G27G24G21G26G26G24G39G27G25G25G25G21G26G21G3A当G25G31G27时G21G23G3CG3EG3FG31G27 G26G21G25G25当G25G31G21G26时G21G23G3CG40G41G31G2EG26G26G23G3AG2EG26G26G25G23G25G27 G26G21G25G24G3AG21G31G21G21G36G21G27G31G2BG26誗G27 G2BG26G26G24G23G24 G36G29G2AG23G36G27G26 G26G26G26G21即G27G21G31G24G2AG23G36G21G21G25 G26G26G26誗G2EG26G26G25G23G25G27 G26G21G25G24G24G39G24G2AG33G26G21G3AG21随G23的增大而减小G24G3A当G23G31G27G26G21G25时G21G21最小G21G21G3CG40G41G31G21G26G2A G30G27G26G23此时G27 G26G21G25G31G2BG25G27G24G27G26G26G25G36G27 G2BG26G26G21解得G27G25G31G27或G25G31G2BG2E誗舍去G24G23G3A当通道宽为G27米时G21修建的通道和花圃的总造价最低G21为G21G26G2A G30G27G26元G23十二G22一次函数G21第一课时G22自主探究誗自主学习G21G24略G22G27G24解析式法G22图象法G22列表法G22G29G24G2BG33G24G21G22G2BG24誗G21G24誗G2BG24G25誗G21G24G22G2AG24略G25G23G24G2BG25G21G25G29G22G2DG23G21G2E誗自我尝试G2EG23G21G31G27G22G24G21G22G30G23G26G33G21G22G21G26G23G28G22G21G21G23G28G22G21G27G23G2FG22G21G29G23G2FG22G21G2BG23G28G21G2AG23誗G21G24G21G21 G29G21 G21G23G27G21 G29G23G29G23G22誗G27G24G21G21G31G26G23G21G22誗G22G23G26G24G25当G26G25G22G25G27G26时G21G21G27G31G26G23G21G27G22G21当G22G2CG27G26时G21G21G27G31G26G23G21G27G38G27G26G36G26G23G26G30誗G22G24G27G26G24G21即G21G27G31G26G23G26G30G22G36G26G23G25G23誗G29G24顾客在乙复印店复印花费少G23当G22G2CG2DG26时G21有G21G21G31G26G23G21G22G21G21G27G31G26G23G26G30G22G36G26G23G25G23G3AG21G21G24G21G27G31G26G23G21G22G24誗G26G23G26G30G22G36G26G23G25G24 G31G26G23G26G21G22G24G26G23G25G23记G21G31G26G23G26G21G22G24G26G23G25G21由G26G23G26G21G2CG26G21G21随G22的增大而增大G21又G22G31G2DG26时G21有G21G31G26G23G21G23G3AG22G2CG2DG26时G21有G21G2CG26G23G21G21即G21G2CG26G23G3AG21G21G2CG21G27G23G3A当G22G2CG2DG26时G21顾客在乙复印店复印花费少G23开放作业G21G25G23G21G31G21G2AG27G22誗G26G33G22G33G21G26G24G22G21G2DG23G29G2AG22G21G2EG23誗G21G24不同G22誗G27G24G21G31G24G2BG2EG22G36G27G2BG26誗G27G23G2AG25G22G25G2AG24G22誗G29G24当G22G31G2B时G21G21G31G24G2BG2EG38G2BG36G27G2BG26G31G2BG2E誗G42G3CG24G21G30G23解G27誗G21G24设商场应购进G30型台灯G22盏G21则G31型台灯为誗G21G26G26G24G22G24盏G21根据题意得G21G29G26G22G36G2AG26誗G21G26G26G24G22G24 G31G29 G2AG26G26G23解得G22G31G2DG2AG21所以G21G21G26G26G24G2DG2AG31G27G2AG24答G27应购进G30型台灯G2DG2A盏G21G31型台灯G27G2A盏G24誗G27G24设商场销售完这批台灯可获利G21元G21则G21G31誗G2BG2AG24G29G26G24G22G36誗G2DG2AG24G2AG26G24誗G21G26G26G24G22G24G21G31G21G2AG22G36G27 G26G26G26G24G27G22G21G31G24G2AG22G36G27 G26G26G26G24G39G31型台灯的进货数量不超过G30型台灯数量的G29倍G21G3AG21G26G26G24G22G25G29G22G24G3AG22G23G27G2AG24自主学习指导课程G30G22ZHIDAOKECHENG誗誗数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数数学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学学誗誗G39G2BG31G24G2AG33G26誗G3AG22G31G27G2A时誗G21取得最大值誗为G24G2AG38G27G2AG36G27 G26G26G26G31G21 G2EG2DG2AG23元G24G24答G27商场购进G30型台灯G27G2A盏誗G31型台灯G2DG2A盏誗销售完这批台灯时获得最多誗此时利润为G21 G2EG2DG2A元G23拓展学习G27G26G23G23G21誗G24G27G24G27G21G23G23G21G24解方程G22G27G24G21G2BG22G36G2BG2EG31G26得G22G21G31G25誗G22G27G31G2EG24G39G32G30誗G32G29G23G32G30G2CG32G29G24的长分别是G22G27G24G21G2BG22G36G2BG2EG31G26的两个实数根誗G3AG32G29G31G25誗G32G30G31G2EG24G22G3AG29G23G26誗G25G24G24G23G27G24设直线G33G34解析式为G21G31G2BG22G36G23G23G2BG24G26G24G24由G23G21G24知G32G30G31G2E誗则G30G23G2E誗G26G24G24G39点G30誗G29都在直线G33G34上誗G3AG2EG2BG36G23G31G26誗G23G31G25G24G22解得G2BG31G24G29G2B誗G23G31G25G24G22G3A直线G33G34解析式为G21G31G24G29G2BG22G36G25G240/.#$“1111YZG23G29G24G39G30G23G2E誗G26G24誗G29G23G26誗G25G24誗G22G3A由题意得G31G23G2E誗G25G24G24G39以G2D誗G31誗G29三点为顶点的三角形是等腰三角形誗G3AG22当G2DG29G31G2DG31时誗点G2D是线段G31G29的垂直平分线与直线G33G34的交点誗则G2DG21G23G2B誗G29G24G25G23当G2DG29G31G31G29时誗G25G27G36G23 G24G29G2BG25G36G25G24G25G24G27G31G25G2B誗G22解得G25G31G32G29G27G2A誗则G2DG27G23 G24G29G27G2A誗G2AG2BG2AG24誗G2DG29G23G29G27G2A誗G25G2AG24G25G24当G2DG31G31G31G29时誗G23G25G24G2EG24G27G36G23 G24G29G2BG25G36G25G24G25G24G27G31G25G2B誗G22解得G25G3