（1）求[8（x-y)四次方+（y-x）³]÷[2（x-y)²]结果（2）已知x-y=1,xy=2,求x³y-2x²y²+xy³的值

（1）求[8（x-y)四次方+（y-x）³]÷[2（x-y)²]结果（2）已知x-y=1,xy=2,求x³y-2x²y²+xy³的值
（1）求[8（x-y)四次方+（y-x）³]÷[2（x-y)²]结果
（2）已知x-y=1,xy=2,求x³y-2x²y²+xy³的值

（1）求[8（x-y)四次方+（y-x）³]÷[2（x-y)²]结果（2）已知x-y=1,xy=2,求x³y-2x²y²+xy³的值
[8（x-y)四次方+（y-x）³]÷[2（x-y)²]
=8（x-y)四次方÷[2（x-y)²]-（x-y）³] ÷2（x-y)²]
=4(x-y)²-(x-y)/2
x³y-2x²y²+xy³
=xy(x²-2xy+y²)
=xy(x-y)²
=2