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你能严格证明红蓝二个三角形不能拼成正方形吗? |
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鲁班锁吧http://tieba.baidu.com/f?kw=%C2%B3%B0%E0%CB%F8
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回复 88#
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www.fenzland.com新做的个人站,欢迎光临
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