(3x^2y-2xy^2)-2(x^2y-2xy^2)其中x=-4,y=-1/2化简求值
3个回答
(3x^2y-2xy^2)-2(x^2y-2xy^2)
=x^2y+2xy^2
=xy(x+2y)
=-4x-1/2x(-4-1/2x2)
=2x-5
=-10
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