[Toán 9] Cực trị

N

nguyenbahiep1

[TEX]A = \frac{x-2}{3} + \frac{3}{x-2} + \frac{2}{3} \geq 2.\sqrt{\frac{x-2}{3}.\frac{3}{x-2}} + \frac{2}{3} \\ A \geq \frac{8}{3} \\ Min A = \frac{8}{3} \\ x = 5[/TEX]
 
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