摘要：25． 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
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（本题满分12分）如图，直线l1的解析表达式为：
，且l1与x轴
交于点D，直线l2经过点A，B，直线l1，l2交于点C．
【小题1】（1）求直线l2的函数关系式；
【小题2】（2）求△ADC的面积；
【小题3】（3）若点H为坐标平面内任意一点，在坐标平面内是否存在这样的点H，使以A、D、C、H为顶点的四边形是平行四边形？若存在，请直接写出点H的坐标；若不存在，请说明理由．
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，且l1与x轴交于点D，直线l2经过点A，B，直线l1，l2交于点C．
【小题1】（1）求直线l2的函数关系式；
【小题2】（2）求△ADC的面积；
【小题3】（3）若点H为坐标平面内任意一点，在坐标平面内是否存在这样的点H，使以A、D、C、H为顶点的四边形是平行四边形？若存在，请直接写出点H的坐标；若不存在，请说明理由．
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（本题满分12分）如图，直线l1的解析表达式为：
，且l1与x轴
交于点D，直线l2经过点A，B，直线l1，l2交于点C．
【小题1】（1）求直线l2的函数关系式；
【小题2】（2）求△ADC的面积；
【小题3】（3）若点H为坐标平面内任意一点，在坐标平面内是否存在这样的点H，使以A、D、C、H为顶点的四边形是平行四边形？若存在，请直接写出点H的坐标；若不存在，请说明理由．
（本题满分12分）如图，直线l1的解析表达式为：
，且l1与x轴
交于点D，直线l2经过点A，B，直线l1，l2交于点C．
小题1:（1）求直线l2的函数关系式；
小题2:（2）求△ADC的面积；
小题3:（3）若点H为坐标平面内任意一点，在坐标平面内是否存在这样的点H，使以A、D、C、H为顶点的四边形是平行四边形？若存在，请直接写出点H的坐标；若不存在，请说明理由．
，且l1与x轴交于点D，直线l2经过点A，B，直线l1，l2交于点C．
小题1:（1）求直线l2的函数关系式；
小题2:（2）求△ADC的面积；
小题3:（3）若点H为坐标平面内任意一点，在坐标平面内是否存在这样的点H，使以A、D、C、H为顶点的四边形是平行四边形？若存在，请直接写出点H的坐标；若不存在，请说明理由．
+1，点C的坐标为(–4，0)，平行四边形OABC的顶点A，B在抛物线上，AB与y轴交于点M，已知点Q(x，y)在抛物线上，点P(t，0)在x轴上. 