(m²+2mn+n²)-(m²-2mn+n²)的全过程 快急
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(m²+2mn+n²)-(m²-2mn+n²)的全过程 快急
(m²+2mn+n²)-(m²-2mn+n²)的全过程 快
急
(m²+2mn+n²)-(m²-2mn+n²)的全过程 快急
(m²+2mn+n²)-(m²-2mn+n²)
=(m+n)²-(m-n)²
=(m+n+m-n)(m+n-m+n)
=2mx2n
=4mn