A, CHO A, B, C > 0 CMR
Câu 2:
a, Cho a, b, c > 0
CMR:
a b
2
2
b c
2
2
a c
2
2
1
1
1
a
b
b
c
a
c
a
b
c
b, Cho 0
a, b, c
1
CMR: a+b+c+
1
abc
1
1
1
a
b
c
+ abc
Câu 2:
a, Cho a, b, c > 0
CMR:
a b
2
2
b c
2
2
a c
2
2
1
1
1
a
b
b
c
a
c
a
b
c
b, Cho 0
a, b, c
1
CMR: a+b+c+
1
abc
1
1
1
a
b
c
+ abc