Tim min

N

nguyenbahiep1

[laTEX]P = a + \frac{1}{a} = \frac{a}{9}+ \frac{1}{a}+\frac{8a}{9} \geq \frac{2}{3}+\frac{8.3}{9} = \frac{10}{3} \\ \\ \Rightarrow a= 3[/laTEX]
 
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