题目内容
计算:
(1)
+2
-4
+
;
(2)
•(-
)÷
(a>0,b>0).
(1)
| 75 |
| 12 |
| 27 |
| 3 |
(2)
| 2 |
| b |
| ab5 |
| 3 |
| 2 |
| a3b |
| 1 |
| 3 |
|
(1)原式=5
+4
-12
+
=-2
;
(2)原式=
•(-
)•3•
=-
•
=-9a2b
.
| 3 |
| 3 |
| 3 |
| 3 |
=-2
| 3 |
(2)原式=
| 2 |
| b |
| 3 |
| 2 |
ab5•a3b•
|
=-
| 9 |
| b |
| a4•b4•ab |
=-9a2b
| ab |
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