题目内容
计算:
(1)
•(-
)÷3
;
(2)(
+
)•
-7
.
(1)
| 2 |
| b |
| ab5 |
| 3 |
| 2 |
| a3b |
|
(2)(
| 72 |
| ||
2+
|
| 3 |
| 6 |
(1)原式=-
÷3
=-
×
×
=-
=-a2b
;
(2)原式=(6
+
)•
-7
=(6
+2
-
)•
-7
=6
+2
-3
-7
=
-3
.
| 3 |
| b |
| a4b6 |
|
=-
| 3 |
| b |
| 1 |
| 3 |
a4b6×
|
=-
| 1 |
| b |
| a5b5 |
=-a2b
| ab |
(2)原式=(6
| 2 |
| ||||
(2+
|
| 3 |
| 6 |
=(6
| 2 |
| 2 |
| 6 |
| 3 |
| 6 |
=6
| 6 |
| 6 |
| 2 |
| 6 |
=
| 6 |
| 2 |
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