S
soibac_pro_cute


cho a,b >0, a+b =< 1. CMR
1/(a^2+b^2) + 1/(2ab)\geq4
giúp mình vớihuiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
1/(a^2+b^2) + 1/(2ab)\geq4
giúp mình vớihuiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii