在平面直角坐标系中,已知点
、
.若直线
上存在点P使得
,则实数
的取值范围是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448c0a5ee776d19ce8e42ac9a5fd27c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316ba5cbb31299d683ac6c7dd795db85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1a8ba78658831f9fce13aafa1d93973.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dc566ab5d3b50417b7964a971806017.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2020-11-29 19:44:05
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【推荐1】点
为圆
内一点,
为圆上的动点,且
,则线段
中点的轨迹方程为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d69f777281a6319434ccb7e845cc354.png)
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【推荐2】在平面直角坐标系中,
为坐标原点,
的坐标为
,点
为动点,且满足
,记
,若
的最小值为
,则
的最大值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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【推荐1】已知
,直线
与直线
平行,
与
交于A,B两点,
上有且仅有n个不同的点
使
为等腰三角形. ①若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
______ ;②若
,则实数b的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3a9b723303acf1669d4d88a7172b99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d34144af7bfc1567e352301e41e0448.png)
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【推荐2】古希腊著名数学家阿波罗尼斯发现:平面内到两个定点距离之比为定值
(
且
)的点的轨迹是圆,此圆被称为“阿氏圆”.在平面直角坐标系
中,点
,满足
的动点
的轨迹为
,若在直线
上存在点
,过点
引圆
的两条切线
使得
则实数
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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