题目内容
计算
(1)
-
-
+
(2)(3+2
)2-(4+
)(4-
)
(3)2
+4
-
-
.
(1)
| 12 |
| 27 |
| 48 |
| 50 |
(2)(3+2
| 5 |
| 7 |
| 7 |
(3)2
| 12 |
|
| 48 |
|
(1)原式=2
-3
-4
+5
=-5
+5
;
(2)原式=9+12
+20-(16-7)
=9+12
+20-9
=12
+20;
(3)原式=4
+
-4
-
=-
.
| 3 |
| 3 |
| 3 |
| 2 |
=-5
| 3 |
| 2 |
(2)原式=9+12
| 5 |
=9+12
| 5 |
=12
| 5 |
(3)原式=4
| 3 |
4
| ||
| 9 |
| 3 |
2
| ||
| 3 |
=-
32
| ||
| 9 |
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