题目内容
若
=
=
(a≠0)，则
=______．
| a |
| 3 |
| b |
| 5 |
| c |
| 7 |
| a+b+c |
| a |
设
=
=
=x，
∴a=3x，b=5x，c=7x，
∴
=
=5．
| a |
| 3 |
| b |
| 5 |
| c |
| 7 |
∴a=3x，b=5x，c=7x，
∴
| a+b+c |
| a |
| 15x |
| 3x |
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题目内容
| a |
| 3 |
| b |
| 5 |
| c |
| 7 |
| a+b+c |
| a |
| a |
| 3 |
| b |
| 5 |
| c |
| 7 |
| a+b+c |
| a |
| 15x |
| 3x |