如果(x+1)^2+/y+2/=0,求代数式5xy-2/3x^3y^2-4yx+1/2y^2x^3-1/2xy-3x^3y^2-y^2x^3的值5xy-3/2x^3y^2-4yx+1/2y^2x^3-1/2xy-3x^3y^2-y^2x^3
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