已知椭圆的中心在原点,左焦点为
,右顶点为
.
(1)求该椭圆的标准方程;
(2)若
是椭圆上的动点,过
点向椭圆的长轴作垂线,垂足为
求线段
的中点
的轨迹方程;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8504b267cf6cdbf6c4375ad47fdbd551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46cf8d088865c81ff18c36f80c17b91a.png)
(1)求该椭圆的标准方程;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c123204222ccd33946d5613378624d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6312c1b1ecc7cd8dd9c7fd5b603b47f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
12-13高二上·山东济宁·期末 查看更多[1]
(已下线)2011-2012学年山东省济宁市曲阜一中高二上学期期末考试文科数学
更新时间:2016-12-01 14:29:07
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解答题-问答题
|
适中
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名校
【推荐1】已知椭圆
,右焦点为
,
,且
,椭圆
的离心率为
.
(1)求椭圆
的标准方程;
(2)设直线
的方程为
,当直线
与椭圆
有唯一公共点
时,作
于
(
为坐标原点),若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b4e362e4a56b8da0b78e5bf2127f87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40630a669f4eedf626bc24851df10c85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/976842338a5c11b86741236d49a49548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15b256345d7109e081b7c895591e995d.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf59107b1cb4f2c9dc9f27525311e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df35de5d9b87d2be352b819b9e2e7bc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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解答题-证明题
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适中
(0.65)
【推荐2】设椭圆
的左右焦点分别为
,离心率
,右准线为
,
是
上的两个动点,
.
(Ⅰ)若
,求
的值;
(Ⅱ)证明:当
取最小值时,
与
共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5ff77ecf0acec4f0ae05105f20a821.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075ba8c6fb5ef7288cd3fed425c8e69e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/232bbc31a186ad96f199e38aaac85aa9.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f4daa51fdbff42c3499fa0dc1d46d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
(Ⅱ)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b33a08aa12bc8a1c671f8cb673ed0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd2f4a1d844109029bfcc367b109bcf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f2b73f94a0e94402e8f444f82e6e62d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/eab63433-5e1b-4a0f-b8cf-91dc0ec24b10.png?resizew=178)
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解题方法
【推荐1】已知椭圆
:
的长轴为
,动点P是椭圆上不同于A,B的任一点,点Q满足
,
.
(1)求点Q的轨迹
的方程;
(2)过点
的动直线l交
于M,N两点,y轴上是否存在定点S,使得
总成立?若存在,求出定点S;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09c03c6b8d7418edf20f474389971352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70e8b17a7840ae7b75590da92fa0965b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85e4cb1a0ea1b684e80129f2415ef2e4.png)
(1)求点Q的轨迹
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1596b30209c15300a6cc8fb8ba47caf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/111b7407405cff5b830fe0f7f491687d.png)
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解答题-问答题
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【推荐2】已知动圆
过定点
,且内切于定圆
.
(Ⅰ)求动圆圆心
的轨迹
方程;
(Ⅱ)在(Ⅰ)的条件下,记轨迹
被
所截得的弦长为
,求
的解析式及其最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26de0ecf0557addaf2c750832324ffa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/042d6eadfc71ebc87fa19a9f9d9a1001.png)
(Ⅰ)求动圆圆心
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(Ⅱ)在(Ⅰ)的条件下,记轨迹
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54479885d4ab2f717d2e97718da04b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a388195f018498a0b049bd2d09263245.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a388195f018498a0b049bd2d09263245.png)
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