已知分式 x−1x+1 的值是零，那么x的值是_刷题宝

题干

已知分式 −

x

1

x

+

1

的值是零，那么x的值是（）

A：﹣1

B：0

C：1

D：±1

上一题下一题 0.0难度选择题更新时间:2016-02-18 07:13:33

答案(点此获取答案解析）

C

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