(X + 1) /(x - 1)

来源：学生作业帮助网编辑：六六作业网时间：2024/12/22 16:06:55

(X+1)/(x-1)(X+1)/(x-1)(X+1)/(x-1)(X+1)/(x-1)(X+1)/(x-1)(X+1)/(x-1)-1(X+1)/(x-1)-(x-1)/(x-1)(X+1-x+1)

(X + 1) /(x - 1)
(X + 1) /(x - 1)

(X + 1) /(x - 1) <1
(X + 1) /(x - 1) -1<0
(X + 1) /(x - 1) -(x - 1)/(x - 1)<0
(X + 1-x+1) /(x - 1)<0
2/(x - 1)<0

将右边的1移到左边，则变为（x+1）/(x-1)-(x-1)/(x-1)<0 分子相减得2，分母还是x-1

(x+1)/(x-1)<1
所以(x+1)/(x-1)-1<0
所以通分得，（x+1-x+1)/(x-1)<0
所以，2/(x-1)<0

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