当x满足时x-1/(x+1)(x-1)有意义

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当x满足时x-1/(x+1)(x-1)有意义

当x满足时x-1/(x+1)(x-1)有意义
当x满足时x-1/(x+1)(x-1)有意义

当x满足时x-1/(x+1)(x-1)有意义
X不等于1或者负1,即分母不为零,分数才有意义.

x不等于1或-1