已知集合
,
,若
,则实数a的取值范围为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4396bb161137d5583e96fd4fda207c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe65c8d2bf130c3b4c7c319b872ebaf.png)
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2018·上海静安·二模 查看更多[3]
更新时间:2020-02-28 23:14:36
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【知识点】 直线与圆的实际应用
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【推荐1】如图所示,第九届亚洲机器人锦标赛
中国选拔赛永州赛区中,主办方设计了一个矩形坐标场地
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点4米的F处放置一只电子狗,在距离
点2米的
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,那么电子狗将被机器人捕获,点
叫成功点.在这个矩形场地内成功点
的轨迹方程是__________ ;若
为矩形场地
边上的一点,电子狗在线段
上总能逃脱,则
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解题方法
【推荐2】已知圆
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上存在点
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作圆
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6862bf0ebc9b0a83f0a0497212eadfd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/269c2f7fe82077ae3113d83af46ea832.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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