x^3y^3-5x^2y^2+7/2xy-2
=(-1)×(1/8)-5×1×1/4+7/2×(-1)×(1/2)-2
=-1/8-5/4-7/4-2
=-41/8
x^3y^3-5x^2y^2+7/2xy-2 其中x等于-1,y=1/2
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