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令 $\vv{a_{ij}}=(a_i,a_j)$,则六个数分别为 $\vv{a_{12}}\cdot\vv{a_{34}}$, $\vv{a_{12}}\cdot\vv{a_{56 ... kuing 发表于 2013-10-10 18:12
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回复 isee k的这个证法也太牛笔了吧? 其妙 发表于 2013-10-10 22:42
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