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-(3x-2y-z)-2(4x-3(x-2y-z)-2)
人气:185 ℃ 时间:2020-04-02 00:57:19
解答
-(3x-2y-z)-2(4x-3(x-2y-z)-2)
=-3x+2y+z-2(4x-3x+6y+3z-2)
=-3x+2y+z-8x+6x-12y-6z+4
=-5x-10y-5z+4
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