1.4m-m(3a-2)^2
问题描述：
1.4m-m(3a-2)^2
2.9-6y^3+y^6
3.x^3-x^2-2x+2
答
1.4m-m(3a-2)^2=m(4-4+12a-9a^2)=3ma(4-3a)
2.9-6y^3+y^6=(y-3)^2
3.x^3-x^2-2x+2=x^2(x-1)-2(x-1)=(x^2-2)(x-1)=(x+根2)（x-根2）(x-1)