练习册

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    009]解:(1)①轴.轴. 四边形为矩形． 轴.轴. 四边形为矩形． 轴.轴. 四边形均为矩形．············ 1分 . . ． ． . . ．······························································································ 2分 ②由(1)知． ． ．············································································································ 4分 . ．································································································ 5分 ． ．············································································································· 6分 轴. 四边形是平行四边形． ．············································································································· 7分 同理． ．············································································································· 8分 (2)与仍然相等．························································································· 9分 . . 又. ．································· 10分 ． ． . ． ． ．············································································································ 11分 轴. 四边形是平行四边形． ． 同理． ．·········································································································· 12分 【查看更多】

     

    题目列表(包括答案和解析)

    如图，是二次函数y=ax2+bx+c图象的一部分，其对称轴为直线x=1，若其与x轴一交点为A（3，0），则由图象可知，方程ax2+bx+c=0的另一个解是（　　）

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    已知二次函数y=x2-6x+5．
    （1）请写出该函数的对称轴，顶点坐标；
    （2）函数图象与x轴交点坐标为
    ，与y轴的交点坐标为
    ；
    （3）当
    时y＞0，
    时y随x的增大而增大；
    （4）写出不等式x2-6x+5＜0的解集．

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    如图，直线y=k和双曲线y=
    k
    x
    相交于点P，过P点作PA0垂直x轴，垂足A0，由
    y=k
    y=
    k
    x
     可解得x=1，即A0横坐标为1．x轴上的点A0、A1、A2、…．An的横坐标是连续整数．过点A1、A2、…、An分别作x轴的垂线，与双曲线y=
    k
    x
    （x＞0精英家教网）及直线y=k分别交于点B1、B2、…、Bn、C1、C2、…．Cn．
    （1）求
    C1B1
    A1B1
    的值；
    （2）求
    C2B2
    A2B2
    的值；
    （3）试猜想
    CnBn
    AnBn
    的值（直接写答案）．

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    如图是抛物线y=ax2+bx+c的一部分，其对称轴为直线x=1．若抛物线与x轴一个交点为A（3，0），则由图象可知，不等式ax2+bx+c≥0的解集是：
    x≤-1或x≥3
    x≤-1或x≥3
    ．

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    如图，在平面直角坐标系中，点A、B分别在x轴y轴的正半轴上，线段OA的长是不等式5x-4＜3（x+2）的最大整数解，线段OB的长是一元二次方程x2-2x-3=0的一个根，将Rt△ABO沿BE折叠，使AB边落在OB边所在的y轴上，点A与点D重合．
    （1）求OA、OB的长；
    （2）求直线BE的解析式；
    （3）在平面内是否存在点M，使B、O、E、M为顶点的四边形为平行四边形？若存在，请直接写出点M的坐标；若不存在，请说明理由．

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