先化简再求值:-2(mn-3m²)-[m²-5(mn-m²)+2mn],其中m=1 n=-2
人气:353 ℃ 时间:2019-10-17 01:40:05
解答
-2(mn-3m²)-[m²-5(mn-m²)+2mn]
=-2mn+6m²-m²+5mn-5m²-2mn
=mn
=1x-2
=-2
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