[-3(m-1)]²-4m(2m-3) 怎么解

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[-3(m-1)]²-4m(2m-3) 怎么解
[-3(m-1)]²-4m(2m-3) 怎么解

[-3(m-1)]²-4m(2m-3) 怎么解
=9(m-1)²-8m²+12m
=9m²-18m+9-8m²+12m
=m²-6m+9

原式=9m²-18m+9-8m²+12m
=m²+2m+9