题目内容
化简求值:(1-
)÷
,其中x=3.
| 3 |
| x+2 |
| x2-1 |
| x+2 |
(1-
)÷
=
•
=
,当x=3时,原式=
.
| 3 |
| x+2 |
| x2-1 |
| x+2 |
=
| x+2-3 |
| x+2 |
| x+2 |
| (x+1)(x-1) |
=
| 1 |
| x+1 |
| 1 |
| 4 |
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题目内容
| 3 |
| x+2 |
| x2-1 |
| x+2 |
| 3 |
| x+2 |
| x2-1 |
| x+2 |
| x+2-3 |
| x+2 |
| x+2 |
| (x+1)(x-1) |
| 1 |
| x+1 |
| 1 |
| 4 |