-8m2-[4m-2m2-（3m-m2-7）-8]=_．

分类: 作业答案 • 2021-12-28 14:51:21

问题描述：

-8m²-[4m-2m²-（3m-m²-7）-8]=______．

答

-8m²-[4m-2m²-（3m-m²-7）-8]=-8m²-[4m-2m²-3m+m²⁺7-8]=-8m²-（-m²+m-1）=-8m²+m²-m+1=-7m²-m+1