Tìm GTNN

T

transformers123

$A=\dfrac{\sqrt{x}-2}{\sqrt{x}+4}$

$\iff A=1-\dfrac{6}{\sqrt{x}+4}$

$\iff A \ge 1-\dfrac{6}{4}$

$\iff A \ge \dfrac{-1}{2}$

Dấu "=" xảy ra khi $x=0$
 
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