Cho $a,b,c$ là độ dài ba cạnh của một tam giác thỏa mãn: $b+2c=abc.$ Tìm giá trị nhỏ nhất của biểu thức:
                         $F=\frac{3}{b+c-a}+\frac{4}{a+c-b}+\frac{5}{a+b-c}.$
$A=\frac{1}{b+c-a}+\frac{1}{a+c-b}+2(\frac{1}{b+c-a}+\frac{1}{a+b-c})+3(\frac{1}{a+c-b}+\frac{1}{a+b-c})\geq \frac{2}{c}+\frac{4}{b}+\frac{6}{a}=2(a+\frac{3}{a})\geq 4.\sqrt{3}$
ngon :)) –  Wade 24-01-15 11:05 PM

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