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已知xy^2=-2,求-xy(x^2y^5-xy^3-y)的值.
人气:264 ℃ 时间:2019-10-19 11:49:07
解答
-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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