如图,已知抛物线
的焦点为
,过点
作直线
交抛物线于
,
两点,记
,
.
![](https://img.xkw.com/dksih/QBM/2020/9/13/2549139531096064/2550125029498880/STEM/20408f4bdf754e3ca8995eac31ceffe8.png?resizew=179)
(1)若
,求
的最小值;
(2)若对任意的直线
,
,
恒为锐角,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78e0869218aa81fab96f1bbae926a016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/228647e3970fa3cedebc2bab946d69ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e32f2ac377dd6289ce061130f60db556.png)
![](https://img.xkw.com/dksih/QBM/2020/9/13/2549139531096064/2550125029498880/STEM/20408f4bdf754e3ca8995eac31ceffe8.png?resizew=179)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc272934625d1232ad34eedc6b23267.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655901318ba5a902cff95ee693e2227c.png)
(2)若对任意的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f64fa38725c136504f723019a18dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e93fa313adc4ac7608ba9449fd755212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
20-21高三上·浙江宁波·阶段练习 查看更多[2]
更新时间:2020-09-15 08:25:33
|
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【推荐2】已知椭圆方程为
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【推荐1】已知抛物线
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(2)已知椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a39030c2cbb3e33127dbd4f7574d504.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cc66be3e49c75a366f3f8cc6172487a.png)
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【推荐2】已知过点
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【推荐1】如图,已知以F为焦点的抛物线
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【推荐2】已知直线l的斜率为k,且过点
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