题目内容
已知
=
=
≠0，求
的值．
| x |
| 3 |
| y |
| 4 |
| z |
| 6 |
| x+y-z |
| x-y+z |
设
=
=
=k，
则x=3k，y=4k，z=6k，
∴
=
=
．
| x |
| 3 |
| y |
| 4 |
| z |
| 6 |
则x=3k，y=4k，z=6k，
∴
| x+y-z |
| x-y+z |
| 3k+4k-6k |
| 3k-4k+6k |
| 1 |
| 5 |
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