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1.a=3.b=2 a的二次方减2ab加b的二次方=1 (a-b)的二次方=1 2.a=-3.b=2, a的二次方减2ab加b的二次方=25 (a-b)的二次方=25 所以 a的二次方减2ab加b的二次方=(a-b)的二次方
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