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已知xy^2=-2xy(x^2y^5-xy^3-y)

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已知xy^2=-2xy(x^2y^5-xy^3-y)
已知xy^2=-2xy(x^2y^5-xy^3-y)
xy(x^2y^5-xy^3-y)
=xy^2 (x^2y^4-xy^2-1)
=(xy^2) [(xy^2)^2-(xy^2)-1]
=-2×[(-2)²-(-2)-1]
=-10
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