题目内容
计算：
•
-
•
=______．
| b+1 |
| a |
| a+1 |
| b |
| b-1 |
| a |
| a-1 |
| b |
| b+1 |
| a |
| a+1 |
| b |
| b-1 |
| a |
| a-1 |
| b |
| (b+1)(a+1) |
| ab |
| (b-1)(a-1) |
| ab |
| ab+a+b+1-(ab-b-a+1) |
| ab |
| 2(a+b) |
| ab |
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| b+1 |
| a |
| a+1 |
| b |
| b-1 |
| a |
| a-1 |
| b |
| b+1 |
| a |
| a+1 |
| b |
| b-1 |
| a |
| a-1 |
| b |
| (b+1)(a+1) |
| ab |
| (b-1)(a-1) |
| ab |
| ab+a+b+1-(ab-b-a+1) |
| ab |
| 2(a+b) |
| ab |
应用题作业本系列答案