已知xy²=-2,求-xy(x²y的五次方-xy³-y)的值
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![已知xy²=-2,求-xy(x²y的五次方-xy³-y)的值](/uploads/image/z/1627433-17-3.jpg?t=%E5%B7%B2%E7%9F%A5xy%26%23178%3B%3D-2%2C%E6%B1%82%EF%BC%8Dxy%28x%26%23178%3By%E7%9A%84%E4%BA%94%E6%AC%A1%E6%96%B9%EF%BC%8Dxy%26%23179%3B%EF%BC%8Dy%EF%BC%89%E7%9A%84%E5%80%BC)
已知xy²=-2,求-xy(x²y的五次方-xy³-y)的值
已知xy²=-2,求-xy(x²y的五次方-xy³-y)的值
已知xy²=-2,求-xy(x²y的五次方-xy³-y)的值
-xy(x²y的五次方-xy³-y)
=-x³y^6+x²y^4+xy²
=-(xy²)³+(xy²)²+xy²
=-(-2)³+(-2)²+(-2)
=-8+4-2
=-6