Question

2m(m-n)^2-4n(n-m)^3 （分解因式）

Answer 1

2m(m-n)^2-4n(n-m)^3

=2m(m-n)^2+4n(m-n)^3

=2(m-n)^2[m+2n(m-n)]

-7m(m-n)^3+21mn(n-m)^2

=-7m(m-n)^3+21mn(m-n)^2

=-7m(m-n)^2(m-n+3n)

=-7m(m-n)^2(m+2n)