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化简3(x²y+xy)-4(x²y-xy)-5x²y,
人气:472 ℃ 时间:2020-02-04 07:11:51
解答
3(x²y+xy)-4(x²y-xy)-5x²y
=3x²y+3xy-4x²y+4xy-5x²y
=-6x²y+7xy
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