题目内容
已知
=
=
≠0，求
的值．
| x |
| 3 |
| y |
| 4 |
| z |
| 5 |
| x-y+z |
| x+y+z |
设x=3k，则y=4k，z=5k，代入可得
=
=
=
．
| x-y+z |
| x+y+z |
| 3k-4k+5k |
| 3k+4k+5k |
| 4k |
| 12k |
| 1 |
| 3 |
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题目内容
| x |
| 3 |
| y |
| 4 |
| z |
| 5 |
| x-y+z |
| x+y+z |
| x-y+z |
| x+y+z |
| 3k-4k+5k |
| 3k+4k+5k |
| 4k |
| 12k |
| 1 |
| 3 |