题目内容
设
=
=
，则
=______，
=______．
| x |
| 3 |
| y |
| 5 |
| z |
| 7 |
| x+y |
| y |
| y+3z |
| 3y-2z |
根据题意，设
=
=
=k，
则x=3k，y=5k，z=7k，
则
=
=
.
=
=26，
故填
；26．
| x |
| 3 |
| y |
| 5 |
| z |
| 7 |
则x=3k，y=5k，z=7k，
则
| x+y |
| y |
| 3k+5k |
| 5k |
| 8 |
| 5 |
| y+3z |
| 3y-2z |
| 5k+21k |
| 15k-14k |
故填
| 8 |
| 5 |
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