题目内容
若
=
=
•
,则x的取值范围是( )
x2-1 |
(x+1)(x-1) |
x+1 |
x-1 |
A.x≥-1 | B.x≥1 | C.x≤1 | D.-1≤x≤1 |
∵要使已知式子有意义,必须x+1≥0且x-1≥0,
∴x≥-1且x≥1,
∴x≥1,
故选B.
∴x≥-1且x≥1,
∴x≥1,
故选B.
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题目内容
x2-1 |
(x+1)(x-1) |
x+1 |
x-1 |
A.x≥-1 | B.x≥1 | C.x≤1 | D.-1≤x≤1 |