Tìm GTNN

E

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$A=\sqrt{x^2+1}+\sqrt{(x+1)^2+2^2} \ge \sqrt{(x-x-1)^2+(1+2)^2}=\sqrt{10}$

Dấu "=" xảy ra \Leftrightarrow $x=\dfrac{-1}{3}$
 
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