题目内容
计算(1+
)÷(1+
)的结果为( )
| 1 |
| x-1 |
| 1 |
| x2-1 |
| A.1 | B.x+1 | C.
| D.
|
(1+
)÷(1+
)=
÷
=
•
=
,
故选C.
| 1 |
| x-1 |
| 1 |
| x2-1 |
| x-1+1 |
| x-1 |
| x2-1+1 |
| x2-1 |
| x |
| x-1 |
| (x+1)(x-1) |
| x2 |
| x+1 |
| x |
故选C.
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