题目内容
(m+
n-1)(m-
n+1)-(m-1)2+(
n+1)2．
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原式=m2-（
n-1）2-（m-1）2+（
n+1）2
=m2-
n2+n-1-m2+2m-1+
n2+n+1
=2n+2m-1．
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=m2-
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=2n+2m-1．
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