八年级下数学期末试卷及答案.doc

the principle of simplified EIA of construction projects in the region. In terms of land, linked to the implementation of urban and rural construction land increase and decrease, replacement indicators for priority areas project. Charges, into the projects of water, electricity, administrative charges and preferential policies. In the area of taxation, and settled in areas of industry and its production company, within 5 years after the completion of fiscal incentives to enterprises. In terms of financing, integration of land, tax, financial and other resources, and construct Government credit + business credit credit system, establishment of marketization, commercialization and modernization of the investment and financing platform; effective Bank-enterprise docking, encourages private capital into the Park, to raise industry development fund. 5, optimize the environment and service industries. To create policy lowlands, Highlands, integrity of service land, development land as the goal, to optimize the area under development environment. All administrative law enforcement departments to appoint a full-time personnel stationed in areas dedicated to coordinating and solving problems associated with businesses in this sector. When there are substantial issues, sector leaders arranged to personally intervene, in-person, in-person push tangible area building a green light, easy line. To further reduce and standardize administrative examination and approval items, simplify examination and approval links, improve efficiency; according to the .Since the educational practice of the mass line of the party, himself seriously in the education, practical control central eight rules and opposing the four winds and practicing three Suns, and check the spirit of Jiao Yulu, ideology, solicit opinions based on outstanding problems checked swing, careful analysis and reflection. Will now check report is as follows: first, adherence to the partys political discipline, eight in the central provision, change the style of the basic situation of 1, in compliance with the partys political disciplines. Conscientiously abide by the partys political discipline, abide by the Constitution and the rules and regulations of the party, in the political, ideological and maintain highly consistent with the CPC Central Committee on the action, there is no violation of the partys political discipline problems. 2, in the implementation of the central authorities of the eight provisions. Improving research, improving research methods, but there are less grass-roots units, primary first-hand an inadequate grasp of the problem, which is to be strengthened in the future. Second, construction, strictly in accordance with the provisions to streamline and improve the quality of meetings of the Conference. Third, streamlining file briefs, culture involves all aspects of propaganda and ideology, sometimes due to the practical needs of invention notifications, this area needs further请不要在密封线内答题 学校 班级 姓名 考号 顺序号 命题人：蒋坤初审人：周维琼终审人：苏有强20112012学年度下期末考试八年级数学试题（时间120分钟 满分150分） 卷首语：亲爱的同学，这份试卷将再次记录你的自信、沉着、智慧和收获. 我们一直投给你信任的目光。请认真审题，看清要求，仔细答题. 预祝你取得好成绩！一、选择题（每小题4分，共40分）1.若分式的值为，则的值为（ ）A. B. C. D.2.已知反比例函数的图像经过点（1，2），则它的图像一定也经过（）A(1,2) B. (1,2) C(1，2) D（0，0）3.菱形的两条对角线长分别为6cm、8cm，则它的面积为（ ） A. 6 B. 12 C. 24 D. 484.若将分式中的a与b的值都扩大为原来的2倍，则这个分式的值将（ ）A扩大为原来的2倍 B分式的值不变 C缩小为原来的 D缩小为原来的5.对于数据：10，18，15，15，13，13，14下列说法中错误的是( )A这组数据的平均数是14B这组数据的众数是15和13C这组数据的中位数是14D这组数据的方差是366已知在（ ）A. 4 B. 6 C. 8 D. 107. 函数与在同一坐标系中的图象可能是（ ） A B C D8.下列说法正确的是（ ） A、一组数据的众数、中位数和平均数不可能是同一个数 B、一组数据的平均数不可能与这组数据中的任何数相等八年级数学共6页 第1页 C、一组数据的中位数可能与这组数据的任何数据都不相等 D、众数、中位数和平均数从不同角度描述了一组数据的波动大小9.某厂接到加工720件衣服的订单，预计每天做48件，正好按时完成，后因客户要求需提前3天交货，设每天应多加工件，则应满足的方程为（ ）。 A B C D10. 如图，已知正方形ABCD中，对角线AC、BD交于O点，AB =1cm，过B作BGAC，过A作AECG，且ACG：G =5:1，以下结论：AE=cm；四边形AEGC是菱形； CE =cm ；CFE为等腰三角形，其中正确的有（ ）A B C D二、填空题（每小题4分，共24分）11.化简 。12. 如图，在平面直角坐标系中，是反比例函数图象上一点，过点作轴于点，则这个反比例函数的解析式是 .13. 如图，在菱形ABCD中，BAD80，AB的垂直平分线交对角线AC于点E，交AB于点F，F为垂足，连接DE，则CDE_ _度.14. 某市广播电视局欲招聘播音员一名，对两名候选人进行了两项素质测试，两人的两项测试成绩如右表所示根据实际需要，广播电视局将面试、综合知识测试的得分按的比例计算两人的总成绩，那么 （填或）将被录用15如图，梯形ABCD中，ADBC,B=70，C=40，若AD=3，BC=10，则CD= 16. 顺次连接一矩形场地ABCD的边AB、BC、CD、DA的中点E、F、G、H，得到四边形EFGH，M为边EH的中点，点P为小明在对角线EG上走动的位置，若AB=10米，BC=米，当PM +PH的和为最小值时，此时EP的值为_。三、解答题（每小题6分，共24分）17. 解方程：18化简： 19如图，E、F是四边形ABCD的对角线AC上两点，AF=CE，DF=BE,且 DFBE。(1) 求证：AFDCEB；（2）求证：四边形ABCD是平行四边形。20. 在“争做环保卫士，共建森林重庆”的活动中，某校初二（1）班的同学活动热情极高，每位同学都交了废旧报纸，根据同学们所交废旧报纸的质量，小华整理出了如下统计表：质量（千克）12345人数（人）4920125根据表中信息回答下列问题：（1）初二（1）班所交废旧报纸质量的中位数为 千克，众数为 千克；（2）计算初二（1）班平均每人交废旧报纸多少千克？-密-封-线-（3）市邮政局根据每班所交废旧报纸的总质量，每3公斤给班级赠送环保宣传贺卡一张（不足3公斤部分不赠送贺卡），则初一（1）班将会获得多少张宣传贺卡？四、解答题（每小题10分，共40分）EBFCAD21.如图，在平行四边形中，在上存在一点，沿直线把折叠，使点恰好落在边上的点处，若的面积为，求的长22. 如图，已知一次函数的图象分别与轴、轴的正半轴交于、两点，且与反比例函数交于、两点，点在第二象限，过点作轴于点，（1）求反比例函数与一次函数的解析式；（2）求的面积请不要在密封线内答题 学校 班级 姓名 考号 顺序号 23. 先化简，再求值：，其中满足方程.24. 家乐福超市用5000元购进一批新品种的苹果进行试销，由于销售状况良好，超市又挑拨11000元资金购进该品种苹果，但这次的进货价比试销时每千克多了0.5元，购进苹果数量是试销时的2倍.（1）试销时该品种苹果的进货价是每千克多少元？（2）如果超市将该品种苹果按每千克7元的定价出售，当大部分苹果售出后，余下的400千克按定价的七折售完，那么超市在这两次苹果销售中共盈利多少元？五、解答题（第25题10分，第26题12分，共22分）25. 如图，直角梯形ABCD中，ADBC，A=90，交AB于E，DF平分EDC交BC于F，连结EFFDBAEC第25题图（1）证明：；（2）若，求CF的长26. 正方形ABCD中，E点为BC中点，连接AE，过B点作BFAE，交CD于F点，交AE于G点，连结GD，过A点作AHGD交GD于H点.(1)求证：ABEBCF；(2)若正方形边长为4，AH=，求AGD的面积. 八年级下期数学期末试题参考答案一、（每小题4分，共40分） BACBD CADDB二、（每小题4分，共40分）11. 2 12. 13. 60度14. B 15. CD= 7 16. 三、（每小题6分，共24分）17. 解：两边同乘以 x-2，得1分 2分 1分 1分 检验：时，所以是原方程的根1分18. 解：原式 2分 2分 1分 1分 19. （1）证明：DFBE1234AF=CE，DF=BE,AFDCEB.3分（2）证明：AFDCEB 56且AD=BC AD=BC,AD/BC 四边形ABCD为平行四边形.3分20.（1）中位数 3，众数 32分（2）平均每人 千克2分（3）由（2）知共交155千克， 所以可获得51张宣传贺卡2分四、解答题（每小题10分，共40分）21.解：22. 解：（1） 过 4分 令 过 过 4分（2）2分23. 解：原式 6分 原式4分24.解：（1）设试销时该品种苹果的进货价为每千克x 元，由题意得 3分 解得x=5 2分 经检验，x=5是原方程的解1分 （2）首次购入苹果数量为50005=1000 千克，第二次购入数量为21000=2000千克 两次苹果的总售价为=7（1000+2000-400）=18200 元 所以两次苹果销售利润=18200-（5000+11000）=4160 元3分答：试销时该品种苹果的进货价是每千克5元，两次苹果销售中共盈利4160元。1分五、解答题（第25题10分，第26题12分，共22分）25. （1）证明：过D作DGBC于G由已知可得，四边形ABGD为正方形 分FDBAEC第25题图G DEDC，ADE+EDG=90=GDC+EDG，ADE=GDC 3分又A=DGC，且AD=GD，ADEGDC DE=DC，且AE=GC 4分在EDF和CDF中，EDF=CDF，DE=DC，DF为公共边，EDFCDFEF=CF 6分（2）AD=3AE， 7分设，则，BE=62=4. 由勾股定理，得 解之，得， 即 CF = EF=510分26. (1)正方形ABCD中，ABE=90，1+2=90， 又AEBF，3+2=90，则1=3 （2分） 又四边形ABCD为正方形，ABE=BCF=90，AB=BC 在ABE和BCF中， ABEBCF(ASA) （5分）（2）延长BF交AD延长线于M点，MDF=90 （6分） 由（1）知ABEBCF，CF=BE E点是BC中点，BE=BC，即CF=CD=FD，在BCF和MDF中， BCFMDF(ASA) BC=DM，即DM=AD，D是AM中点 （9分） 又AGGM，即AGM为直角三角形， GD=AM=AD 又正方形边长为4，GD=4 SAGD=GDAH=4= （12分）BAEGCHFDM综合蓄热法保温施工的工艺特点：将混凝土的组成材料进行加热，然后搅拌，掺加入外加剂在经过运输、振捣后仍然具有一定的温度，浇筑后的混凝土周围用保温材料严密覆盖，使新浇混凝土在一定时间内保持正温streamlining. Four are standard visits, except as required to participate in training, no other activity. Five is to improve news reporting, for propaganda work strictly according to the regulations. Six is strictly your presentation published strictly according to the regulations. Seven is strictly thrift, required the use of vehicles and office space and corporate hospitality. 3, change the style. Propaganda and ideological work of the new situation and new requirements of the new tasks, had done a lot of fruitful work, has made many achievements, but further closer to the grass roots, close to reality, close to the masses and also inadequate innovation must continue to improve. Second, the four winds some outstanding issues 1, oppose formalism. One theory is that he didnt, with less close contact. Theoretical study of consciousness is not high enough, system performance is not strong enough; more passive learning, active learning few generalities and learn more, delving into less. Especially based on rational thinking on major issues, applying theory to guide the work done is not good enough, not really understand and grasp the spirit and essence of the scientific Outlook on development, did not truly achieve mastery, to apply, to a certain extent, affect the development and implementation of ideas and initiatives. Second, work arrangements, and less supervision. Propaganda and ideological work is the objective, which needs to keep the continuity efforts deployed, but stressed in the work time, less supervision. For example, color weekends in the summer theatrical activities, city square performances, urging townships, communities and rural areas shows the implementation is inadequate, insufficient cultural an educational role to play. Third base enough, master grass-less real. Propaganda and ideological work in the new situation of characteristics and regularity of enough, deep enough for grass-roots public opinion Dynamics survey, for grass-roots typically drive less. For example, rural culture team active, . Im not actively take the initiative to take up, the lack of spirit of daring to, resulting in some job had a lot of power, but no t