设直线
与圆
交于
,
两点,若
的圆心在线段
上,且圆
与圆
相切,切点在圆
的劣弧
上,则圆
半径的最大值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a6b676fc870f63c2431b66de9762af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9edf67c2e68042e26faefd72455386c4.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/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
更新时间:2017-02-22 12:08:09
|
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名校
解题方法
【推荐1】已知函数
(
),其中
是半径为4的圆
的一条弦,
为原点,
为单位圆上的点,设函数
的最小值为
,当点
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的最大值为3,则线段
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐2】已知椭圆
,过点
的直线交椭圆于
两点,则以
为直径的圆过定点______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ab5ed3dd54f42da747b01afdb7b031.png)
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【推荐1】如图,两条距离为4的直线都与y轴平行,它们与抛物线
和圆
分别交于
和
,且抛物线的准线与圆相切,则当
取得最大值时,直线
的方程为_________ .
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填空题-双空题
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较难
(0.4)
名校
解题方法
【推荐2】已知抛物线
:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc58c62444bf42a25289c45425a00f2.png)
的准线交圆
:
于
,
两点,若
,则抛物线
的方程为______ ,已知点
,点
在抛物线
上运动,点
在圆
:
上运动,则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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解题方法
【推荐1】在平面直角坐标系
中,
为直线
:
上在第一象限内的点,
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交于另一点
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的横坐标的取值范围为______________ .
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【推荐2】在平面直角坐标系
中,圆
:
.若圆
存在以
为中点的弦
,且
,则实数
的取值范围是__________ .
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