设不等式组
表示的平面区域为
,在区域
内随机取一个点,则此点到坐标原点的距离大于2的概率是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea6812200216e4161ffa123708f1fcd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
更新时间:2017-04-17 19:20:27
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解题方法
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