(3m^3-2m^2+m)-(4m^3-2m^2+3m),其中m=-1; 求答案
问题描述:
(3m^3-2m^2+m)-(4m^3-2m^2+3m),其中m=-1; 求答案
答
3m^3-2m^2+m)-(4m^3-2m^2+3m),
=3m^3-2m^2+m-4m^3+2m^2-3m
=-m^3-2m
=-(-1)^3-2*(-1)
=1+2
=3