已知a与b互为相反数,c与d互为倒数,x=3(a-1)-(a-2b) y=c^2d-(d/c+c-1) 求(2x+y)/3-(3x-2y)6 急死了 好加
人气：181 ℃ 时间：2019-11-12 09:45:25
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