4(x-y)三次方-2y(y-x)平方 3m(m-n)平方-6n(n-m)

问题描述:

4(x-y)三次方-2y(y-x)平方 3m(m-n)平方-6n(n-m)

4(x-y)三次方-2y(y-x)平方
=2(x-y)²(2(x-y)-y)
=2(x-y)²(2x-3y);
3m(m-n)平方-6n(n-m)
=3(m-n)(m(m-n)+2n)
=3(m-n)(m²-mn+2n)