B
botvit


Cho 3 số dương a,b,c chứng minh rằng:
[TEX]\frac{a}{b+c}+\frac{b}{c+a}+\frac{c}{a+b} \geq \frac{3}{2}[/TEX]
[TEX]\frac{a}{b+c}+\frac{b}{c+a}+\frac{c}{a+b} \geq \frac{3}{2}[/TEX]
Last edited by a moderator: