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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