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    时间：2023-12-02 05:20:59    下载该word文档
    德阳市2007年初中毕业生学业考试
    数学参考答案及评分意见
    一、选择题（每小题2分，共24分）1．Ｃ2．Ｂ3．Ｄ7．Ｄ8．Ｂ9．Ｃ二、填空题（每小题3分，共15分）13．10
    14．

    15．6

    16．10

    17．(14，8


    4．Ｃ

    10．Ａ

    5．Ａ11．Ｄ

    6．Ａ12．Ｂ

    三、解答题（第18题5分，第19题7分，第20题8分，第21题7分，共27分）18．解：(21014141422
    1······························································································3分
    ·········································································································5分1
    ·19．证明：四边形ABCD是平行四边形，
    BDC∥AF．·DC∥A，即························1分，C2．1FE为BC的中点，
    E·CEB．··················································4分E△F．B·△DC≌·····································6分F·CDB．·················································7分

    D
    C
    1E
    23A
    B
    F


    20．解：（1）设袋中有x个红球，据题意得2x211219题答图
    ，解得x1．（或212）31．袋中有红球1个．·········································································3分（2）画树状图如下：

    ·······················································································································6分第二个球
    白2红黑白1红黑
    白1白2黑
    白1白2红
    第一个球
    白1白2红
    黑


    P（摸得一红一白）41213．········································································8分
    21．解：（1）连结OC．·······················································································1分DC切O于点C，OCD90．················································2分又ACD120，
    1ACOACDO120A90．3C
    OB
    D
    OCO，AAACO30
    21题答图
    COD60．D30，CAD．C·························································································5分
    OCODOCOBBDOBOBBD（2）sinD
    OB，sinDsin3012，
    1．
    OB102解得OB10．即O的半径为10．···················································7分
    四、解答题（第22题7分，第23题8分，共15分）22．解：（1）①甲甲2·············································································3分②3，5.5·····················································································5分（2）甲在47时的生产速度最快，
    407412x1010，他在这段时间内每小时生产零件10个．·············7分
    23．解：设甲队单独完成需x天，则乙队单独完成需要2x天．根据题意得············1分
    1x20解得x30．
    1，·······················································································3分
    经检验x30是原方程的解，且x30，2x60都符合题意．·············5分应付甲队30100030000（元）．
    应付乙队30255033000（元）．
    公司应选择甲工程队，应付工程总费用30000元．······························8分五、解答题（第24题9分，第25题10分，共19分）24．解：（1）315，E90，12，
    175．················································2分
    AD
    5又B45，
    OFEB145O
    475F
    1．····3分
    C
    32E
    1B
    （2）连结AD．
    OFE120，DFO60，
    24题答图


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