(2x-y)2(x-y)(x+2y)=?
1个回答

(2x-y)²(x-y)(x+2y)

=(4x²-4xy+y²)(x²+2xy-xy-2y²)

=(4x²-4xy+y²)(x²+xy-2y²)

=4x^4+4x³y-8x²y²-4x³y-4x²y²+8xy³+x²y²+xy³-2y^4

=4x^4+11x²y²+9xy³-2y^4

(x-y)(x+2y)

=x(x+2y)-y(x+2y)

=x²+2xy-xy-2y²

=x²+xy-2y²