题目内容
计算:
(1)
-
(
-2
);
(2)3
-2x
+
(x>0).
(1)
| 1 | ||
|
| 6 |
| 3 |
| 2 |
(2)3
|
|
| 5 |
| 4 |
|
(1)
-
(
-2
)=
-3
+4
=-
+4
;
(2)3
-2x
+
=
-2
+
=-
.
| 1 | ||
|
| 6 |
| 3 |
| 2 |
| ||
| 2 |
| 2 |
| 3 |
5
| ||
| 2 |
| 3 |
(2)3
|
|
| 5 |
| 4 |
|
3
| ||
| 4 |
| 2x |
| ||
| 8 |
| 9 |
| 8 |
| 2x |
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