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可以用反证法。假设不是在中点位置，你取其他位置算出来的距离和在中点位置的距离减一下，会发现一个大于0的式子In Reply To:网上的解法虽然都过了，但是谁能证明是对的 Posted by:306469974 at 2013-03-10 08:33:05 > 总是觉得有问题 Followed by:
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