Normal
Cho \[a;b;c > 0\] sao cho \[a+b+c = 1\]CMR:\[(1+a)(1+b)(1+c)\geq (1-a)(1-b)(1-c)\]
Cho \[a;b;c > 0\] sao cho \[a+b+c = 1\]
CMR:
\[(1+a)(1+b)(1+c)\geq (1-a)(1-b)(1-c)\]
