因式分解：[x（x²y²-xy）-y（x²-x³y）]÷3x²y急 十万火急 13:40之前有奖励!

因式分解：[x（x²y²-xy）-y（x²-x³y）]÷3x²y急 十万火急 13:40之前有奖励!
因式分解：[x（x²y²-xy）-y（x²-x³y）]÷3x²y
急 十万火急
13:40之前有奖励!

因式分解：[x（x²y²-xy）-y（x²-x³y）]÷3x²y急 十万火急 13:40之前有奖励!
[x（x²y²-xy）-y（x²-x³y）]÷3x²y
=[x²y（xy-1）-x²y（1-xy）]÷3x²y
=x²y[（xy-1）-（1-xy）]÷3x²y
=x²y[2（xy-1）]÷3x²y
=2（xy-1)/3

[x（x²y²-xy）-y（x²-x³y）]÷3x²y
=[x³y²-x²y-yx²＋x³y²]÷3x²y
=[2x³y²-2x²y]÷3x²y
=【2xy-2】/3

原式=[x²y(xy-1)-x²y(1-xy)]÷3x²y
=(xy-1-1+xy)÷3
=(2xy+2)/3

：[x（x²y²-xy）-y（x²-x³y）]÷3x²y
=（x³y²-x²y-x²y+x³y²）÷3x²y
=（2x³y²-2x²y）÷3x²y
=2x²y（xy-1）÷3x²y
=2/3（xy-1）