八年级数学,整式的乘法

【x(x²y²-xy)-y(x²-x³y)】÷3x²y

【x(x²y²-xy)-y(x²-x³y)】÷3x²y=(x³y²-x²y-x²y+x³y²)÷3x²y
=(2x³y²-2x²y)÷3x²y
=2xy/3 -2/3
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第1个回答  2013-12-15
【x(x²y²-xy)-y(x²-x³y)】÷3x²y=2(x³y²-x²y)÷3x²y=2xy/3-2/3