B
bugana


cho a,b,c>0 thoả mãn [TEX]a+b+c=1[/TEX] .CMR
[TEX]\frac{a+b}{\sqrt{ab+c}}+\frac{b+c}{\sqrt{bc+a}}[/TEX][TEX]+\frac{c+a}{\sqrt{ac+b}}\geq3[/TEX]
[TEX]\frac{a+b}{\sqrt{ab+c}}+\frac{b+c}{\sqrt{bc+a}}[/TEX][TEX]+\frac{c+a}{\sqrt{ac+b}}\geq3[/TEX]
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