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[x(x²y-xy)-y(x²-x³y)]÷3x²y
=x^2y[(x-1)-(1-xy)]÷3x²y
=[(x-1)-(1-xy)]÷3
=(x-2+xy)/3
=x^2y[(x-1)-(1-xy)]÷3x²y
=[(x-1)-(1-xy)]÷3
=(x-2+xy)/3
追问
[x(x²y²-xy)-y(x²-x³y)]÷3x²y 刚才打错了 这个是原题
追答
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
=x^2y[(xy-1)-(1-xy)]÷3x²y
=[(xy-1)-(1-xy)]÷3
=-2/3
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