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(x^2y+xy)-3(x^2y-xy)-4x^2y 化简 其中x=1 y=-1
人气:129 ℃ 时间:2019-11-07 06:15:08
解答
2(x^2y+xy)-3(x^2y-xy)-4x^2y
=2x²y+2xy-3x²y+3xy-4x² y
=-5x²y+5xy
=5-5
=0
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