问题
填空题
设a,b∈R+,a+2b=3,则
|
答案
∵
+1 a
=1 b
(a+2b)(1 3
+1 a
)=1 b
(3+1 3
+2b a
)a b
≥
×21 3
+12
∴
+1 a
最小值是1+1 b 2 2 3
故答案为:1+
.2 2 3
设a,b∈R+,a+2b=3,则
|
∵
+1 a
=1 b
(a+2b)(1 3
+1 a
)=1 b
(3+1 3
+2b a
)a b
≥
×21 3
+12
∴
+1 a
最小值是1+1 b 2 2 3
故答案为:1+
.2 2 3