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Re:谁能解释一下A的样例？我怎么算都觉得是3In Reply To:谁能解释一下A的样例？我怎么算都觉得是3 Posted by:Fortuna at 2005-11-13 12:00:51 > 正方形的两个顶点恰好是(2,3)和(3,2)，这样这个四边形的面积不就是3了吗？ 不是的 求得是阴影的面积 Followed by:
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