【（2x³y-2x²y²）+xy（2xy-x²）】÷x²y
=（2x³y-2x²y²）/x²y+xy（2xy-x²）/x²y
=2x-2y+2y-x
=x
楼主可能把(2xy-2x²)打成(2xy-x²)
此题的题意或者最后的答案是0