题目内容
计算:
(1)
+2
-3
(a≥0);
(2)
-
+
;
(3)
+
-(
-1)0.
(1)
| 50a |
|
| 8a |
(2)
| 27 |
| 12 |
| 45 |
(3)
| 2 | ||
|
| 27 |
| 3 |
(1)原式=5
+
-6
=
;
(2)原式=3
-2
+3
=
+3
;
(3)原式=
+1+3
-1=4
.
| 2a |
| 2a |
| 2a |
| 2a |
(2)原式=3
| 3 |
| 3 |
| 5 |
| 3 |
| 5 |
(3)原式=
| 3 |
| 3 |
| 3 |
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