计算(1+m)²-(1-m)²

计算(1+m)²-(1-m)²
计算(1+m)²-(1-m)²

计算(1+m)²-(1-m)²
答：
(1+m)²-(1-m)²
=1+2m+m²-（1-2m+m²）
=1+2m+m²-1+2m-m²
=4m
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写错了，不好意思
(1+m)²-(1-m)²
=（1+2m+m²）-（1-2m+m²）
=1+2m+m²-1+2m-m²
=4m