题目内容
已知x，y，z满足
=
=
，求
的值．
| 2 |
| x |
| 3 |
| y-z |
| 5 |
| z+x |
| 5x-y |
| y+2z |
∵
=
=
=
，
∴x=2k，y-z=3k，x+z5k，
∴y=6k，z=3k．
∴
=
=
=
．
| 2 |
| x |
| 3 |
| y-z |
| 5 |
| z+x |
| 1 |
| k |
∴x=2k，y-z=3k，x+z5k，
∴y=6k，z=3k．
∴
| 5x-y |
| y+2z |
| 5×2k-6k |
| 6k+2×3k |
| 4k |
| 12k |
| 1 |
| 3 |
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