题目内容
先化简:再求值:5
+
-
,其中x=
.
|
| 1 |
| 2 |
| 20x |
| 5x |
| 4 |
|
| 1 |
| 3 |
原式=
+
-
=
,
当x=
时,原式=
.
| 5x |
| 5x |
| ||
| 2 |
| 3 |
| 2 |
| 5x |
当x=
| 1 |
| 3 |
| 1 |
| 2 |
| 15 |
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| 1 |
| 2 |
| 20x |
| 5x |
| 4 |
|
| 1 |
| 3 |
| 5x |
| 5x |
| ||
| 2 |
| 3 |
| 2 |
| 5x |
| 1 |
| 3 |
| 1 |
| 2 |
| 15 |