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