若方程
有实数解,则m的取值范围是_____ .
![](https://img.xkw.com/dksih/QBM/2016/4/19/1572595892322304/1572595898425344/STEM/7e566b53810c48bba863ac15ba787b34.png?resizew=109)
更新时间:2016-12-04 05:57:27
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【知识点】 由直线与圆的位置关系求参数
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【推荐1】直线
与圆
相交于
、
两点,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b5edc5de192b9f08baa27e7de51625.png)
_________ .(其中
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【推荐2】在平面直角坐标系
中,已知动圆
的方程为
,则圆心
的轨迹方程为____________ .若对于圆
上的任意点
,在圆
:
上均存在点
,使得
,则满足条件的圆心
的轨迹长度为______ .
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