题目
(2010•西安八校联考)已知正整数a、b满足4a+b=30,则使得
1 |
a |
提问时间:2020-12-25
答案
依题意得
+
=
(
+
)(4a+b)
=
(4+
+
+1)≥
(5+2
1 |
a |
1 |
b |
1 |
30 |
1 |
a |
1 |
b |
=
1 |
30 |
b |
a |
4a |
b |
1 |
30 |
1 |
a |
提问时间:2020-12-25
1 |
a |
1 |
b |
1 |
30 |
1 |
a |
1 |
b |
1 |
30 |
b |
a |
4a |
b |
1 |
30 |