计算(m-n)²/2mn-m²-n²/2mn的结果是
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计算(m-n)²/2mn-m²-n²/2mn的结果是
计算(m-n)²/2mn-m²-n²/2mn的结果是
计算(m-n)²/2mn-m²-n²/2mn的结果是
=[(m-n)²-(m²-n²)]/2mn
=(-2mn+2n²)/2mn
=(n-m)/m
选B