题目内容
计算:
(1)
•
;
(2)
÷
;
(3)(
+
)-(
-
).
(1)
| 3x |
|
(2)
|
|
(3)(
| 45 |
| 18 |
| 8 |
| 125 |
(1)原式=
=x
;
(2)原式=
=3
;
(3)原式=3
+3
-2
+5
=8
+3
-2
.
3x•
|
=x
| y |
(2)原式=
|
=3
| 3 |
(3)原式=3
| 5 |
| 3 |
| 2 |
| 5 |
=8
| 5 |
| 3 |
| 2 |
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