题目内容
计算:
(1)
+
(2)(2
-3
)÷
.
(3)
+
(
-1)-20090.
(1)
| 9a |
| 25a |
(2)(2
| 48 |
| 27 |
| 3 |
(3)
| 3 | ||
|
| 3 |
| 3 |
(1)原式=3
+5
=8
;
(2)原式=(8
-9
)÷
=-
÷
=-1;
(3)原式=
+3-
-1
=2.
| a |
| a |
| a |
(2)原式=(8
| 3 |
| 3 |
| 3 |
=-
| 3 |
| 3 |
=-1;
(3)原式=
| 3 |
| 3 |
=2.
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