化简3（x²y+xy)-4(x²y-xy)-5x²y,
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化简3（x²y+xy)-4(x²y-xy)-5x²y,化简3（x²y+xy)-4(x²y-xy)-5x²y,化简3（x²y+xy)
化简3（x²y+xy)-4(x²y-xy)-5x²y,
化简3（x²y+xy)-4(x²y-xy)-5x²y,
化简3（x²y+xy)-4(x²y-xy)-5x²y,
3（x²y+xy)-4(x²y-xy)-5x²y
=3x²y+3xy-4x²y+4xy-5x²y
=-6x²y+7xy
5xy-8x*xy