3(m-1)²+(m+2)(m²-2m+4)-m(m²+3m-3)
问题描述:
3(m-1)²+(m+2)(m²-2m+4)-m(m²+3m-3)
答
3(m-1)²+(m+2)(m²-2m+4)-m(m²+3m-3)
=3(m²-2m+1)+m³+8-m³-3m²+3m
=3m²-6m+3+m³+8-m³-3m²+3m
=-3m+11