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[几何] 直线与圆

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guanmo1 posted 2015-3-4 09:22 |Read mode
如图
直线与圆.png

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kuing posted 2015-3-4 12:46
由图知无解

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original poster guanmo1 posted 2015-3-4 13:58
回复 2# kuing


    怪不得,PA=AB,打错了。

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kuing posted 2015-3-4 14:10
回复 3# guanmo1

PA=AB 的话,大概就是这个范围:
QQ截图20150304141214.gif

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isee posted 2015-3-4 14:17
回复 2# kuing


   原题中圆与y轴相切,动点在y轴上,自然无解了。

   改了后,直接切割线定理

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