题目内容
化简(1-
)÷
的结果是( )
2 |
x+1 |
1 |
x2-1 |
A.
| B.
| C.(x+1)2 | D.(x-1)2 |
(1-
)÷
=
÷
=
•(x+1)(x-1)
=(x-1)2.
故选D
2 |
x+1 |
1 |
x2-1 |
=
x+1-2 |
x+1 |
1 |
(x+1)(x-1) |
=
x-1 |
x+1 |
=(x-1)2.
故选D
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