| b |
| 5a |
| 2 |
| 3 |
| a+b |
| a-b |
| 2a-1 |
| 3 |
| 5 |
| y |
| b |
| 3 |
| A．4个 | B．5个 | C．6个 | D．7个 |
答案：
代数式中| b |
| 5a |
| 2 |
| 3 |
| a+b |
| a-b |
| 2a-1 |
| 3 |
| 5 |
| y |
| b |
| 3 |
整式有-3x，
| 2 |
| 3 |
| 2a-1 |
| 3 |
| b |
| 3 |
故选：B．
整式有-3x，
故选：B．
| b |
| 5a |
| 2 |
| 3 |
| a+b |
| a-b |
| 2a-1 |
| 3 |
| 5 |
| y |
| b |
| 3 |
| A．4个 | B．5个 | C．6个 | D．7个 |
答案：
代数式中| b |
| 5a |
| 2 |
| 3 |
| a+b |
| a-b |
| 2a-1 |
| 3 |
| 5 |
| y |
| b |
| 3 |
| 2 |
| 3 |
| 2a-1 |
| 3 |
| b |
| 3 |
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