8X^2-5x(4Y-X)+4X(-4x-5/2Y)=
问题描述:
8X^2-5x(4Y-X)+4X(-4x-5/2Y)=
答
8X^2-5x(4Y-X)+4X(-4x-5/2Y)=
=8x²-20xy+5x²-16x²-10xy
=-3x²-30xy