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计算(1+m)²-(1-m)²
人气:105 ℃ 时间:2020-03-19 14:35:39
解答
答:
(1+m)²-(1-m)²
=1+2m+m²-(1-2m+m²)
=1+2m+m²-1+2m-m²
=4m
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