\(B=\left(x+\dfrac{1}{x}\right)+\left(2y+\dfrac{8}{y}\right)+\left(x+y\right)\)
\(B\ge2\sqrt{\dfrac{x}{x}}+2\sqrt{\dfrac{16y}{y}}+3=13\)
\(B_{min}=13\) khi \(\left(x;y\right)=\left(1;2\right)\)
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