(-1/2xy²)³-1/6x(xy³)² ,急,

问题描述:

(-1/2xy²)³-1/6x(xy³)² ,急,

(-1/2xy²)³-1/6x(xy³)²
=-1/8x^3y^6-1/6x^3y^6
=-7/24x^3y^6