题目内容
计算:
①
+|-
|-20120+(
)-1
②
÷
×
③
-(6
-2x
)
④(1-
)2-
.
①
| 8 |
| 2 |
| 1 |
| 2 |
②
| 1 |
| 2 |
3
|
2
|
1
|
③
| 2 |
| 3 |
| 9x |
|
|
④(1-
| 2 |
| ||||
|
(1)原式=2
+
-1+2=3
+1;
(2)原式=
=
;
(3)原式=2
-3
+2
=
;
(4)原式=1-2
+2-(1-
)=1-2
+2-1+
=2-
.
| 2 |
| 2 |
| 2 |
(2)原式=
| 1 |
| 2 |
|
| 1 |
| 2 |
| 2 |
(3)原式=2
| x |
| x |
| x |
| x |
(4)原式=1-2
| 2 |
| 2 |
| 2 |
| 2 |
| 2 |
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