题目内容
计算:
+
-
.
| 1 |
| a |
| 1 |
| b |
| 2a+b |
| 2ab |
原式=
+
-
=
=
=
=
.
| 2b |
| 2ab |
| 2a |
| 2ab |
| 2a+b |
| 2ab |
=
| 2b+2a-(2a+b) |
| 2ab |
=
| 2b+2a-2a-b |
| 2ab |
=
| b |
| 2ab |
=
| 1 |
| 2a |
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题目内容
| 1 |
| a |
| 1 |
| b |
| 2a+b |
| 2ab |
| 2b |
| 2ab |
| 2a |
| 2ab |
| 2a+b |
| 2ab |
| 2b+2a-(2a+b) |
| 2ab |
| 2b+2a-2a-b |
| 2ab |
| b |
| 2ab |
| 1 |
| 2a |