题目内容
已知：
=
=
，求
的值．
| x |
| 3 |
| y |
| 4 |
| z |
| 5 |
| x+y+z |
| x |
设
=
=
=k，
∴x=3k，y=4k，z=5k，
∴
=
=4．
| x |
| 3 |
| y |
| 4 |
| z |
| 5 |
∴x=3k，y=4k，z=5k，
∴
| x+y+z |
| x |
| 3k+4k+5k |
| 3k |
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题目内容
| x |
| 3 |
| y |
| 4 |
| z |
| 5 |
| x+y+z |
| x |
| x |
| 3 |
| y |
| 4 |
| z |
| 5 |
| x+y+z |
| x |
| 3k+4k+5k |
| 3k |