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：2024/04/29 23:02:26
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-6xy+6x²y-xy)
=3x²y-(8x²y-7xy)
=3x²y-8x²y+7xy
=-5x²y+7xy