[Toán 8] Tìm GTNN

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E

eye_smile

$A=\dfrac{x^2-2x+2014}{x^2}=\dfrac{\dfrac{2013}{2014}x^2+\dfrac{1}{2014}(x^2-4028x+2014^2)}{x^2}=\dfrac{2013}{2014}+\dfrac{(x-2014)^2}{2014x^2} \ge \dfrac{2013}{2014}$

Dấu = xảy ra \Leftrightarrow x=2014
 
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