题目内容
先化简,再求值:(1+
)÷
,其中x=
-2.
| x-3 |
| x+3 |
| 2x |
| x2-9 |
| 5 |
原式=
•
=x-3,
∵x=
-2,
∴原式=x-3
=
-2-3
=
-5.
| x+3+x-3 |
| x+3 |
| (x+3)(x-3) |
| 2x |
∵x=
| 5 |
∴原式=x-3
=
| 5 |
=
| 5 |
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题目内容
| x-3 |
| x+3 |
| 2x |
| x2-9 |
| 5 |
| x+3+x-3 |
| x+3 |
| (x+3)(x-3) |
| 2x |
| 5 |
| 5 |
| 5 |