题目内容
先化简,再求值:
÷
•
,其中x=2.
| x |
| 2x-3 |
| 3 |
| 4x2-9 |
| 1 |
| 2x+3 |
原式=
•
•
=
,
当x=2时,原式=
.
| x |
| 2x-3 |
| (2x+3)(2x-3) |
| 3 |
| 1 |
| 2x+3 |
=
| x |
| 3 |
当x=2时,原式=
| 2 |
| 3 |
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题目内容
| x |
| 2x-3 |
| 3 |
| 4x2-9 |
| 1 |
| 2x+3 |
| x |
| 2x-3 |
| (2x+3)(2x-3) |
| 3 |
| 1 |
| 2x+3 |
| x |
| 3 |
| 2 |
| 3 |