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3x²y-{2x²y-3(2xy-x²y-x²y)-xy}
人气:206 ℃ 时间:2019-12-21 07:03:42
解答
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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