作业帮3x²y-{2x²y-3(2xy-x²y-x²y)-xy}
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/28 19:37:44
3x²y-{2x²y-3(2xy-x²y-x²y)-xy}
3x²y-{2x²y-3(2xy-x²y-x²y)-xy}
3x²y-{2x²y-3(2xy-x²y-x²y)-xy}
3x²y-{2x²y-3(2xy-x²y-x²y)-xy}
=3x²y-2x²y+3(2xy-2x²y)+xy
=x²y+6xy-6x²y+xy
=x²y-6x²y+6xy+xy
=-5x²y+7xy