题目内容
计算:
(1)3
-2
+5
;
(2)7
-3a
+
;
(3)
•(-
)÷3
.
(1)3
| 8 |
| 18 |
| 32 |
(2)7
| a |
|
| 2 |
| a |
| a3 |
(3)
| 2 |
| b |
| ab5 |
| 2 |
| 3 |
| a3b |
|
(1)原式=3×2
-2×3
+5×4
=6
-6
+20
=20
;
(2)原式=7
-3
+2
=6
;
(3)原式=
•(-
)×
=-
=-
a2b
.
| 2 |
| 2 |
| 2 |
=6
| 2 |
| 2 |
| 2 |
=20
| 2 |
(2)原式=7
| a |
| a |
| a |
=6
| a |
(3)原式=
| 2 |
| b |
| 2 |
| 3 |
| 1 |
| 3 |
ab5•a3b•
|
=-
| 4 |
| 9b |
| a5b5 |
=-
| 4 |
| 9 |
| ab |
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