-8m2-[4m-2m2-（3m-m2-7）-8]=______．_数学解答

-8m²-[4m-2m²-（3m-m²-7）-8]=______．

人气：473 ℃　时间：2019-11-21 08:22:37

解答

-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