A, CHO A,B > 0, CMR
Bài 3: a, Cho a,b > 0, CMR:
1
a
+1
b
4
a
b
b, Cho a,b,c,d > 0
CMR:a
d
0
+b
c
+d
b
+c
a
d
b
a
d
c
a
b c
1
a
+1
b
4
a
b
b, Cho a,b,c,d > 0
CMR:a
d
0
+b
c
+d
b
+c
a
d
b
a
d
c
a
b c