名校
1 . 已知点
在抛物线
上,
为抛物线的焦点,则直线
的斜率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e2844b73f6be0b9ef0579a5f2e5605.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b35f0b940c8422ef47edc3b7ce55e47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8db072e2b6104671b82f948012fb45.png)
A.3 | B.![]() | C.![]() | D.![]() |
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2 . 如图,线段AB过x轴正半轴上一定点
,端点A,B到x轴距离之积为2m,以x轴为对称轴,过A,O,B三点作抛物线.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/766165b6-48a5-41d6-9172-dcaa206ab736.png?resizew=146)
(1)求抛物线方程;
(2)若
,求m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62769b7177ef4bc952dc1dd51d6b510.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/766165b6-48a5-41d6-9172-dcaa206ab736.png?resizew=146)
(1)求抛物线方程;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28a40c4959cf0ef51fbedc669fdc6a05.png)
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