【x(x²y²-xy)-y(x²-x³y)】÷3x²y
=(x³y²-x²y-x²y+x³y²）÷3x²y
=(2x³y²-2x²y)÷3x²y
=2xy/3-2/3
【x(x²y²-xy)-y(x²-x³y)】÷3x²y
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