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3x的平方y-{2xy-2{xy-2分之3x的平方y}+xy
人气:368 ℃ 时间:2019-10-11 12:30:07
解答
3x²y-{2xy-2(xy-3/2x²y)}+xy
=3x²y-{2xy-2xy+3/2x²y}+xy
=3x²y-2xy+2xy-3/2x²y+xy
=xy
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