x³y-2x²y²+xy³=xy(x²-2xy+y²)=xy(x-y)²=-8×(-6)²=-8×36=-288泪笑为您解答,请点击[采纳为满意回答];如若您有不满意之处,请指出,我一定改正!希望还您一个正确答复!祝您学业...