因式分解:3m[(2x+n)(2x-n)+y(y-4x)]

问题描述:

因式分解:3m[(2x+n)(2x-n)+y(y-4x)]

3m[(2x+n)(2x-n)+y(y-4x)]
=3m=[4x²-n²+y²-4xy]
=3m[(4x²-4xy+y²-n²]
=3m[(2x-y)²-n²]
=3m(2x-y+n)(2x-y-n)