1 . 如图,在平面直角坐标系中,以坐标原点
为极点,
轴的正半轴为极轴建立极坐标系
,极坐标系中
,
,
,
,弧
所在圆的圆心分别为
,
,
,
,曲线
是弧
,曲线
是弧
,曲线
是弧
,曲线
是弧
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/fe293c14-bcea-4ac4-98ad-b4052ef0700a.png?resizew=181)
(1)分别写出
的极坐标方程;
(2)直线
的参数方程为
(
为参数),若直线
与曲线
有两个不同交点
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e5af20b2f8c1fba4470f9650989e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a8fc6d791e325f7c152c905cf08b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4f1b03e54a3347e5e2bfe8a71e8564e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12002540ce4a012749adc0d2e0b1c66b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e439bec5567151742479b189b4423329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0121ca048d5cf813efc7410a4291e8ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f79dc1f0d81fec84527c95246c0c6ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4664e5ca6947382f397b5c69c7c77b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/593d4b073d5a68a023a496878facbf88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7a999c36de5c9a9ce876a4a56fa34c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab94459e87c666facddbe1a23ae1899d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/384bef25d6a7f4c661e83498628c1409.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd42d6ff380e1d9ecad9faef5a7ef5b1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/fe293c14-bcea-4ac4-98ad-b4052ef0700a.png?resizew=181)
(1)分别写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7950ae4c58c7465318d3661ebd08ddf.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3311e816f9e32c203d554e66ba9a53cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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2 . 设椭圆E:
+
=1(a>b>0)的左、右焦点分别为F1,F2,过点F1的直线交椭圆E于A,B两点.若椭圆E的离心率为
,三角形ABF2的周长为4
.
(1)求椭圆E的方程;
(2)设不经过椭圆的中心而平行于弦AB的直线交椭圆E于点C,D,设弦AB,CD的中点分别为M,N,证明:O,M,N三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7355be4fcbc3130a5951364a3be76d6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5268413295580cfda0755ab458b36b64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
(1)求椭圆E的方程;
(2)设不经过椭圆的中心而平行于弦AB的直线交椭圆E于点C,D,设弦AB,CD的中点分别为M,N,证明:O,M,N三点共线.
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3 . 过抛物线
的焦点
作斜率为
的直线,与抛物线相交于点
、
两点,设直线
、
(
为坐标系原点)的斜率分别为
、
,则下列等式正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3764ba3aa0a241787f4661026bb14053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.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/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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