问题
选择题
已知正整数a，b满足4a+b=30，使得
|
答案
∵正数a，b满足4a+b=30，
∴
| 1 |
| a |
| 1 |
| b |
| 1 |
| 30 |
| 1 |
| a |
| 1 |
| b |
=
| 1 |
| 30 |
| b |
| a |
| 4a |
| b |
| 3 |
| 10 |
当且仅当
| b |
| a |
| 4a |
| b |
故选B．
搜题请搜索小程序“爱下问搜题”
已知正整数a，b满足4a+b=30，使得
|
∵正数a，b满足4a+b=30，
∴
| 1 |
| a |
| 1 |
| b |
| 1 |
| 30 |
| 1 |
| a |
| 1 |
| b |
=
| 1 |
| 30 |
| b |
| a |
| 4a |
| b |
| 3 |
| 10 |
当且仅当
| b |
| a |
| 4a |
| b |
故选B．