23-24高二上·江苏·单元测试
解题方法
1 . 若直线l:
与圆C:
交于M,N两点,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3fa93cf39f7a7f320bdf52bd86aa103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc6747545ccd00287f9b1bdd4fec973f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/084cf5ffced059f5653ee2a1023518b7.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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解题方法
2 . 已知
为椭圆
上任意一点,
,
是椭圆的两个焦点,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c82e7d9f4f7ace849e09e9adcb786b7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4823e0eb9cf2f204be4db47fc89b4e36.png)
A.4 | B.3 | C.2 | D.1 |
您最近一年使用:0次