3a的3次方-12a的平方+12a

问题描述:

3a的3次方-12a的平方+12a

3a(3a-2)^2-12a^2

3a^3-12a^2+12a
=3a(a^2-4a+4)
=3a(a-2)^2

=3a(a^2-4a+4)
=3a(a-2)^2

(a-2)(3a-6)