题目内容
根据表中有关数据完成下表．
| r/m | 4.2 | 2.5 | a | |||
| d/m | 7 | 1.8 | b |
如图：
| r/m | 4.2 | 3.5 | 2.5 | 0.9 | a | b÷2 |
| d/m | 8.4 | 7 | 5 | 1.8 | 2a | b |
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题目内容
| r/m | 4.2 | 2.5 | a | |||
| d/m | 7 | 1.8 | b |
| r/m | 4.2 | 3.5 | 2.5 | 0.9 | a | b÷2 |
| d/m | 8.4 | 7 | 5 | 1.8 | 2a | b |