-2(mn-3m²)-[m²-5(mn-m²)+2mn],其中m=1,n=-2 快.
人气:248 ℃ 时间:2019-10-10 04:07:06
解答
-2(mn-3m²)-[m²-5(mn-m²)+2mn]
=-2mn+6m²-m²+5(mn-m²)-2mn
=-4mn+5m²+5mn-5m²
=mn
=-2
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