作业帮3x²y-{2x²y-3(2xy-x²y-x²y)-xy}
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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