已知直线
被两平行直线
与
所截线段
的中点恰在直线
上,已知圆
.
(1)证明直线
与圆
恒有两个交点;
(2)求直线
被圆
截得的弦长最小时的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72db12364c2040b0ef33add8e29e0d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6984a0afaceb7844ac68a9eff837132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd9bb01eec7b497e564474070de4dcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3469ef17f5621814bc4812a8d3593e75.png)
(1)证明直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
更新时间:2016-12-04 21:44:27
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【推荐1】已知椭圆
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(1)求椭圆
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(2)如图,设椭圆
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【推荐2】在平面直角坐标系xOy中,已知P是直线
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当
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【推荐1】已知圆
:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd243fab0af865af67a2ab817e909cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)从圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43e0cac807d10c3dc2f00f29d1687f7f.png)
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解题方法
【推荐2】已知圆
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