题目内容
先化简再求值:(
+3)÷
,其中x=
.(结果精确到0.01)
| 6 |
| x-2 |
| x |
| x2-4 |
| 2 |
(
+3)÷
=
•
=3x+6,
把x=
代入,可得原式=3
+6≈10.24.
| 6 |
| x-2 |
| x |
| x2-4 |
=
| 6+3x-6 |
| x-2 |
| (x+2)(x-2) |
| x |
=3x+6,
把x=
| 2 |
| 2 |
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题目内容
| 6 |
| x-2 |
| x |
| x2-4 |
| 2 |
| 6 |
| x-2 |
| x |
| x2-4 |
| 6+3x-6 |
| x-2 |
| (x+2)(x-2) |
| x |
| 2 |
| 2 |