在平面直角坐标系
中,曲线
,曲线
(
为参数),过原点O的直线l分别交
,
于
,
两点,则
的最大值为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0eb5a69a211e3ee192905b34f43995c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c34be5c1d40940150e35b033aa97c2d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.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/2b2ffb33c9819c06c2d53487373a777b.png)
更新时间:2017-04-11 10:03:14
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适中
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【推荐1】若曲线
上有
个点到曲线
的距离为
,则
的值为____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2057eea69f30c8e526f04602fe314c4a.png)
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名校
【推荐2】在极坐标系中,曲线
和曲线
交于A,B两点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bee8e70f1fab639be1636c7bce0477.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c7afba7fa24b295454141892a5a986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c61957c73cc4e1d76be63babdb46dc0.png)
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解题方法
【推荐1】在极坐标系中,直线
和圆
交于
、
两点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bee8e70f1fab639be1636c7bce0477.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02f5608394a6a0d330073f1c9d597a42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6183bf1f2fce568097003d517d9b99fa.png)
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【推荐2】已知曲线
的极坐标方程为
,曲线
的极坐标方程为
,曲线
、曲线
的交点为
则弦
的长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cda90ec15c07139032c7fed43bcc385.png)
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【推荐1】在平面直角坐标系
中,已知圆
(
为参数)和直线
为参数),则直线
与圆
相交所得的弦长等于____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2beb91f10d2d8f2aa0dcc3f5cd1598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfb3644bef7b126c7da1ad946f01cd76.png)
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【推荐2】已知双曲线的参数方程为
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为参数),那么它的两条渐近线所成的角是_________ .
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解题方法
【推荐1】数学中有许多形状优美、寓意美好的曲线,如星形线(如图),若让一个半径为
的圆在一个半径为
的圆内部,沿着圆的圆周滚动,小圆圆周上的任一点形成的轨迹即为星形线,其方程为
,给出下列四个结论,正确的是__________ .
![](https://img.xkw.com/dksih/QBM/2021/3/13/2677190890668032/2683996552208384/STEM/487c4da65463407f9dfd89bb0ae3a25a.png?resizew=151)
(1)星形线的参数方程为:
(
为参数);
(2)若
,则星形线及其内部包含
个整点;(即横、纵坐标均为整数的点)
(3)曲线
在星形线
的内部(包含边界);
(4)设星形线围成的面积为
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b7081727a19eba3003a689f78872086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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(1)星形线的参数方程为:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba98a3cbae70b69aaa45d034f358b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab839d8569171afab5ed55c22013aa72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ec714b7d7a203ecbcef9232ee7d40da.png)
(3)曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaceba4bfaac6c7a6dff561d92d9096a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bb228a835eea0494d4422a42e77dd69.png)
(4)设星形线围成的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/759b91e7d21377cc9c598ce08e7ee17d.png)
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【推荐2】设质点沿以原点为圆心,半径为
的圆做匀角速度运动,角速度为
,以时间
(单位:
)为参数,则质点运动的轨迹的参数方程为______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e72585dcbe25324c50e81ba365e3f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
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