化简求值{(-1/2x^3y^4)^3+(-1/6xy^2)^2*3xy^2}/(-1/2xy^2)^3其中X=-2,y=1/2
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化简求值{(-1/2x^3y^4)^3+(-1/6xy^2)^2*3xy^2}/(-1/2xy^2)^3其中X=-2,y=1/2
化简求值{(-1/2x^3y^4)^3+(-1/6xy^2)^2*3xy^2}/(-1/2xy^2)^3其中X=-2,y=1/2
化简求值{(-1/2x^3y^4)^3+(-1/6xy^2)^2*3xy^2}/(-1/2xy^2)^3其中X=-2,y=1/2
[2xy^2-2(xy-1/2x^2y)]+3xy^2 =xy[2y-2+x]+3xy^2 =xy(2y-2+x+3y) =xy(5y-x+2) 代入x=3/4,y=-1 =-3/4(-5-3/4+2) =45