题目内容
先化简,再求值:x-2(1-
x)-
x(2-
),其中x=2.
| 3 |
| 2 |
| 2 |
| 3 |
| x |
| 2 |
原式=x-2+3x-
x+
x2=
x2+
x-2,
当x=2时,原式=
+
-2=
.
| 4 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
| 8 |
| 3 |
当x=2时,原式=
| 4 |
| 3 |
| 16 |
| 3 |
| 14 |
| 3 |
练习册系列答案
相关题目
题目内容
| 3 |
| 2 |
| 2 |
| 3 |
| x |
| 2 |
| 4 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
| 8 |
| 3 |
| 4 |
| 3 |
| 16 |
| 3 |
| 14 |
| 3 |