已知xy^2=-2,求-xy（x^2y^5-xy^3-y)的值.
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已知xy^2=-2,求-xy（x^2y^5-xy^3-y)的值.已知xy^2=-2,求-xy（x^2y^5-xy^3-y)的值.已知xy^2=-2,求-xy（x^2y^5-xy^3-y)的值.-xy（
已知xy^2=-2,求-xy（x^2y^5-xy^3-y)的值.
已知xy^2=-2,求-xy（x^2y^5-xy^3-y)的值.
已知xy^2=-2,求-xy（x^2y^5-xy^3-y)的值.
-xy（x^2y^5-xy^3-y)
=-(xy^2)^3+(xy^2)^2+xy^2
=-(-2)^3+4-2
=8+4-2
=10
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