作业帮（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
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![（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](/uploads/image/z/1672820-44-0.jpg?t=%EF%BC%881%EF%BC%89%E6%B1%82%5B8%EF%BC%88x-y%29%E5%9B%9B%E6%AC%A1%E6%96%B9%2B%EF%BC%88y-x%EF%BC%89%26%23179%3B%5D%C3%B7%5B2%EF%BC%88x-y%29%26%23178%3B%5D%E7%BB%93%E6%9E%9C%EF%BC%882%EF%BC%89%E5%B7%B2%E7%9F%A5x-y%3D1%2Cxy%3D2%2C%E6%B1%82x%26%23179%3By-2x%26%23178%3By%26%23178%3B%2Bxy%26%23179%3B%E7%9A%84%E5%80%BC)
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（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