合并多项式中的同类项:2m²+1-3m-7-3m²+5
人气:196 ℃ 时间:2019-10-09 02:34:44
解答
2m²+1-3m-7-3m²+5
=(2m²-3m²)-3m+(1-7+5)
=-m²-3m-1
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