题目内容
计算:
(1)3
-3
+
;
(2)3
×(-
)(a≥0,b≥0).
(1)3
| 12 |
|
| 48 |
(2)3
| 12a3b |
| 2 |
| 3 |
| 6b |
(1)原式=6
-
+4
=9
;
(2)原式=-(3×
)
,
=-2
,
=-12ab
.
| 3 |
| 3 |
| 3 |
| 3 |
(2)原式=-(3×
| 2 |
| 3 |
| 12a3b×6b |
=-2
| 72a3b2 |
=-12ab
| 2a |
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