số 8

K

khaiproqn81

$x-\sqrt{x}=x-\sqrt{x}+\dfrac{1}{4}-\dfrac{1}{4} = (\sqrt{x}-\dfrac{1}{2}^2)-\dfrac{1}{4} \ge -\dfrac{1}{4}$

Dấu $"="$ xảy ra khi $x=\dfrac{1}{2}$
 
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