作业帮已知xy^2=-2 求-xy(x^2y^5-xy^3-y)
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已知xy^2=-2 求-xy(x^2y^5-xy^3-y)
已知xy^2=-2 求-xy(x^2y^5-xy^3-y)
已知xy^2=-2 求-xy(x^2y^5-xy^3-y)
原式=-xy²（x²y^4-xy²-1）
∵xy²=-2
原式=2（（-2)²-（-2）-1）=10
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