在直角坐标系
中,以原点为极点,
轴的正半轴为极轴建立极坐标系.已知曲线
,过点
的直线
的参数方程为
(
为参数),直线
与曲线
分别交于
两点.若
成等比数列,则
的值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee3ed5747742944e9e6d7e3de15da34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88659e1bac79840020d4494440cfb8e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52c4414cdb15bce1caa186b5170097b9.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edbe7df9aef23d33d1fc2d1d338904a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2018-01-09 19:47:50
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适中
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【推荐1】(1).(坐标系与参数方程选讲)在极坐标系中,圆
的极坐标方程为:
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的极坐标为
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的切线,则两条切线夹角的正切值是____ .
(2).(不等式选讲)若关于
的不等式
的解集不是空集,则实数
的取值范围是__________ .
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,P是AB的延长线上一点,过点P作圆O的切线,切点为C,连接AC,若
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(2).(不等式选讲)若关于
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(3).(几何证明选讲)如图圆O的直径
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89efed6b39300185017ac7ff592fa15e.png)
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【推荐2】直线
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(
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上恰有三个点到直线
的距离为
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__________ .
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解题方法
【推荐1】已知直线
:
(
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【推荐2】已知曲线C的极坐标方程为
,则曲线C上的点到直线
为参数)的距离的最大值为___________ .
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