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original poster: isee

[几何] 由2018年北京卷文科第20(3)直线定向三点共线

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original poster isee posted 2018-9-12 16:47

回复 40# kuing

呀，很有爱心与耐心

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色k posted 2018-9-12 19:11

回复 41# isee

说明这两天我闲得蛋疼

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