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全部话题 - 话题: x1y3
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y**t
发帖数: 50
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来自主题: Science版 - Re: 一道Putnam竞赛题
I think you made some mistake in the formula
of the area A.
A=0.5*ABS(x1y2+x2y3+x3y1-x1y3-x2y1-x3y2)
Also it's easy to argue that A>=0.5 from
geometric point of view.
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