题目内容
用合适的方法计算下列各题.
|
|
(1)
+
-
=
+
-
=
;
(2)
-(
-
)
=
+
-
=
-
=
.
| 2 |
| 5 |
| 1 |
| 2 |
| 3 |
| 4 |
=
| 8 |
| 20 |
| 10 |
| 20 |
| 15 |
| 20 |
=
| 3 |
| 20 |
(2)
| 1 |
| 4 |
| 2 |
| 5 |
| 1 |
| 4 |
=
| 1 |
| 4 |
| 1 |
| 4 |
| 2 |
| 5 |
=
| 1 |
| 2 |
| 2 |
| 5 |
=
| 1 |
| 10 |
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