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：2024/06/16 08:19:10
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
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来源：学生作业学帮网 编辑：学帮网 时间：2024/06/16 08:19:10
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