在平面直角坐标系
中,已知椭圆
:
,过点
作斜率为
的直线
与椭圆
交于
,
两点,当
时,
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/271e595c257e4c0ade90a9bbbf0e6b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c10f14aae6fb21e047ecb39cdf40c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6bdac20e214b2cb3bd07f8d4778dcca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2020-03-30 08:28:40
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【推荐1】经过椭圆
的一个焦点作倾斜角为45°的直线
,交椭圆于
两点.设
为坐标原点,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/271e595c257e4c0ade90a9bbbf0e6b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2404ce6f6bd30cbcf7b0c0c81a587161.png)
A.![]() | B.![]() | C.![]() ![]() | D.![]() |
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【推荐2】设椭圆的方程为
,斜率为k的直线l不经过原点O,且与椭圆相交于A,B两点,M为线段AB的中点,下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/376789bd6a2786afd2500908f4b3bf8b.png)
A.直线l与OM一定垂直 |
B.若直线l方程为![]() ![]() |
C.若直线l方程为![]() ![]() |
D.若点M坐标为![]() ![]() |
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【推荐1】已知α,
是关于x的一元二次方程x2+(2m+3)x+m2=0的两个不相等的实数根,且满足
=-1,则m的值是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a85ef415d41705027815a818c46f1d.png)
A.3或-1 | B.3 | C.1 | D.-3或1 |
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【推荐2】已知直线
,椭圆
.若直线l与椭圆C交于A,B两点,则线段AB的中点的坐标为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06553b7e77205d053c1981e9c050d579.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0296bd9900adcc311f59ad44e940b86f.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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