负8m的平方-【4m-2m的平方-(3m-2m的平方-7)】请问怎么写?

问题描述:

负8m的平方-【4m-2m的平方-(3m-2m的平方-7)】请问怎么写?

负8m的平方-【4m-2m的平方-(3m-2m的平方-7)】
=-8m^2-4m+2m^2+3m-2m^2-7
=-8m^2-m-7

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