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顶起来!

Posted by alpc117 at 2007-09-16 21:08:45 on Problem 2124
In Reply To:(x1-x)/(x-x2)=-1 => x1=x2 又因为位置不用x1不等于x2 所以重心不存在 对不对? Posted by:alpc117 at 2007-09-16 19:54:30


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