(m-2)(m²+2m+4)-2m(m²-3),其中m=2

问题描述:

(m-2)(m²+2m+4)-2m(m²-3),其中m=2

-4........................

答:
(m-2)(m²+2m+4)-2m(m²-3)
=m³+2m²+4m-2m²-4m-8-2m³+6m
=-m³+6m-8
=-2³+12-8
=-4