[-3(m-1)]²-4m(2m-3) 怎么解
问题描述：
[-3(m-1)]²-4m(2m-3) 怎么解
答
原式=9m²-18m+9-8m²+12m
=m²+2m+9
答
=9(m-1)²-8m²+12m
=9m²-18m+9-8m²+12m
=m²-6m+9