化简:(1+m)^2-(1-m)^2的结果是____.
问题描述：
化简:(1+m)^2-(1-m)^2的结果是____.
答
:(1+m)^2-(1-m)^2
=(1+m+1-m)(1+m-1+m)
=2×2m
=4m;
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