题目内容
计算:
(1)2
+
-3
+4
(2)
•(-
÷3
).
(1)2
| 7 |
| 2 |
| 7 |
| 2 |
(2)
| ab5 |
| 3 |
| 2 |
| a3b |
|
(1)原式=5
-
;
(2)原式=-
×
×
=-
=-
a2b2
.
| 2 |
| 7 |
(2)原式=-
| 3 |
| 2 |
| 1 |
| 3 |
ab5•a3b•
|
=-
| 1 |
| 2 |
| a5b5 |
=-
| 1 |
| 2 |
| ab |
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