题目内容
若
=
,则
=______.
| x |
| 2 |
| y |
| 5 |
| x-y |
| x+y |
∵
=
,
∴设x=2k,y=5k,
∴
=
=-
.
故答案为:-
.
| x |
| 2 |
| y |
| 5 |
∴设x=2k,y=5k,
∴
| x-y |
| x+y |
| 2k-5k |
| 2k+5k |
| 3 |
| 7 |
故答案为:-
| 3 |
| 7 |
练习册系列答案
相关题目
题目内容
| x |
| 2 |
| y |
| 5 |
| x-y |
| x+y |
| x |
| 2 |
| y |
| 5 |
| x-y |
| x+y |
| 2k-5k |
| 2k+5k |
| 3 |
| 7 |
| 3 |
| 7 |