1 . 已知椭圆C:
对于任意实数
下列直线中被椭圆C截得的弦长与直线
被椭圆C截得的弦长一定相等的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bc35cb1733ae33b488aea6e95cffcc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e35ddf0ecf64817921aba0140b348a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a8d6991873e79b298984a95b8954b9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 设
分别是椭圆
的左、右焦点,过
且斜率不为零的直线
与椭圆
交于
两点,
的周长为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2031d209711b058f3d278ede3c1d33.png)
(1)求椭圆
的方程
(2)是否存在直线
,使得
为等腰直角三角形?若存在,求出直线的方程;若不存在,请说明理由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9783469a92336cfc46e94b60ebbd5c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.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/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5e56b5cbcf69756792fc934bcc20cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2031d209711b058f3d278ede3c1d33.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)是否存在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5e56b5cbcf69756792fc934bcc20cb.png)
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3 . 已知
是椭圆
的长轴,若把线段
五等份,过每个分点作
的垂线,分别与椭圆的上半部分相交于
、
、
、
四点,设
是椭圆的左焦点,则
的值是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd277166f86bab428f324d4c07f6b2ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c44c36da4b1b764376d9972d3768b6b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2019-04-06更新
|
671次组卷
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2卷引用:【全国百强校】四川省南充市阆中中学2018-2019学年高二3月月考文科数学试题
4 . 设
,
分别是椭圆
的左右焦点,
为椭圆的下顶点,
为过点
,
,
的圆与椭圆
的一个交点,且
,则
的值为__________ .
![](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/9c8ec602ab25398355a53eab6b28db0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f434c9d1e243f90bd9c5eac037017802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c6ce02259a85ea191541f4a708738f1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/4ba0882c-9034-477c-acbe-953ee046a044.png?resizew=239)
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2019-04-04更新
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2卷引用:【市级联考】山东省济南市2019届高三3月模拟考试数学(文)试题
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5 . 方程
所表示的曲线的对称性是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f488fc708d3e6fad2bcb78efd7e8387e.png)
A.关于![]() | B.关于![]() |
C.关于![]() | D.关于原点对称 |
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2019-03-16更新
|
635次组卷
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3卷引用:上海市复旦大学附属中学2018-2019学年高二上学期期末考试数学试题