题目内容
已知等式:(1)a+a+b=12;(2)b+a+b=15.如果a和b分别代表一个数,那么a+b是( )
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试题答案
A
| AE |
| AB |
| 1 |
| 2 |
2
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| 3 |
| AE |
| AB |
| 1 |
| 3 |
| ||
| 2 |
| ||
| 2 |
2
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| 4 |
| AE |
| AB |
| 1 |
| 4 |
| 4 |
| 5 |
| AE |
| AB |
| 1 |
| 5 |
| AE |
| AB |
| 1 |
| n |
| 生长素浓度(ppm) | 两天后根段的平均长度(mm) |
| 0 | 12.0 |
| 10-5 | 12.3 |
| 10-4 | 12.8 |
| 10-3 | 12.3 |
| 10-2 | 11.2 |
| 10-1 | 10.6 |
| 生长素浓度(ppm) | 两天后根段的平均长度(mm) |
| 0 | 12.0 |
| 10-5 | 12.3 |
| 10-4 | 12.8 |
| 10-3 | 12.3 |
| 10-2 | 11.2 |
| 10-1 | 10.6 |