J
jennyhan2001


Cho abc = 192, [TEX]a \geq 3, b \geq 4, c \geq 2[/TEX]. Chứng minh:
[TEX]ab\sqrt{c - 2} + bc\sqrt{a - 3} + ac\sqrt{b - 4} \geq 96(\frac{1}{\sqrt{2}} + \frac{1}{\sqrt{3}} + \frac{1}{\sqrt{4}}[/TEX]
[TEX]ab\sqrt{c - 2} + bc\sqrt{a - 3} + ac\sqrt{b - 4} \geq 96(\frac{1}{\sqrt{2}} + \frac{1}{\sqrt{3}} + \frac{1}{\sqrt{4}}[/TEX]
Last edited by a moderator: