先去括号,再合并同类项:3x²y-[2xy²-2(xy-2/3x²y)+xy]+3xy
1个回答
原式=3x²y-[2xy²-2xy+4/3x²y+xy]+3xy²
=3x²y-2xy²+2xy-4/3x²y-xy+3xy²
=5/3x²y+xy²+xy
希望满意采纳.
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