计算：[x(x²y²-xy)-y(x²-x³y）]/3xy

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计算：[x(x²y²-xy)-y(x²-x³y）]/3xy计算：[x(x²y²-xy)-y(x²-x³y）]/3xy计算

计算：[x(x²y²-xy)-y(x²-x³y）]/3xy
计算：[x(x²y²-xy)-y(x²-x³y）]/3xy

计算：[x(x²y²-xy)-y(x²-x³y）]/3xy
原式=(x³y²-x²y-x²y+x³y²)/3xy
=(2x³y²-2x²y)/3xy
=xy(2x²y-2x)/3xy
=(2x²y-2x)/3