1/5单选题
难度：
1.如图，二次函数y=x2-
x-1与x轴交于A、B两点，与y轴交于点C（0，-1），△ABC的面积为
. 在该二次函数的图象上确定一点D，使四边形ACBD为直角梯形时，点D的坐标为（ ）. 
x-1与x轴交于A、B两点，与y轴交于点C（0，-1），△ABC的面积为. 在该二次函数的图象上确定一点D，使四边形ACBD为直角梯形时，点D的坐标为（ ）. | A | （- ，9） |
| B | （，） |
| C | （-，9）或（，） |
| D | （，9）或（-，） |
正确答案：Qw==
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
，0)、B（2，0）两点，且与y轴交于点C. 在此抛物线上存在一点P，使得以A、C、B、P四点为顶点的四边形是直角梯形，点P的坐标是（ ）. 
x2+
x+2
的图像交x轴正半轴于点C（26，0），交y轴于点A（0，8），在直角梯形AOCD中，AD∥OC， AD=24cm，AB=8cm，OC=26cm，动点P从A开始沿AD边向D以1cm/s的速度运动；动点Q从点C开始沿CO边向O以3cm/s的速度运动. P、Q分别从点A、C同时出发，当其中一点到达端点时，另外一点也随之停止运动，设运动时间为ts. 当t为（ ）时，四边形PQCD为直角梯形。
），联结CP和CA，可得直线CP与直线CA相互垂直，点E为坐标轴上的一点，若使得以A、C、P、E为顶点的四边形为直角梯形，则点E的坐标为（ ）. 
，0）、E2（0，