题目内容
若
=
=
，且xyz≠0，则
的值为______．
| x |
| 5 |
| y |
| 4 |
| z |
| 3 |
| x+y+z |
| y+z |
设x=5k，y=4k，z=3k，
∵x+y+z=12k，y+z=7k，
∴
=
．
故答案为
．
∵x+y+z=12k，y+z=7k，
∴
| x+y+z |
| y+z |
| 12 |
| 7 |
故答案为
| 12 |
| 7 |
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题目内容
| x |
| 5 |
| y |
| 4 |
| z |
| 3 |
| x+y+z |
| y+z |
| x+y+z |
| y+z |
| 12 |
| 7 |
| 12 |
| 7 |