题目内容
化简:
(1)
-2
-6
+
;
(2)
÷
×(-
)(a>0,b>0).
(1)
| 27 |
| 8 |
|
| 18 |
(2)
| 2 |
| b |
| ab2 |
| 6a |
| b2 |
|
| 2 |
| 3 |
| a3b |
(1)原式=3
-4
-2
+3
=
-
;
(2)原式=2
÷
×(-
a
)
=-
ab2
.
| 3 |
| 2 |
| 3 |
| 2 |
=
| 3 |
| 2 |
(2)原式=2
| a |
| 6 |
| b2 |
| ab |
| 2 |
| 3 |
| ab |
=-
| 2 |
| 9 |
| a |
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