学帮网3x²y-{2x²y-3(2xy-x²y-x²y)-xy}
来源：学生作业学帮网 编辑：学帮网 时间：2024/05/08 07:28:05
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
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来源：学生作业学帮网 编辑：学帮网 时间：2024/05/08 07:28:05
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