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已知点P(x,y)的坐标满足设A(2,0),则(O为坐标原点)的最大值为 .
已知点P(x,y)的坐标满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756882584518/SYS201311012237568825845013_ST/0.png)
设A(2,0),则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756882584518/SYS201311012237568825845013_ST/1.png)
(O为坐标原点)的最大值为
.
考点分析:
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