\(a,B=2\sqrt{x-5}+\sqrt{x-5}-\dfrac{1}{3}\cdot3\sqrt{x-5}\\ B=2\sqrt{x-5}\\ b,x=8+2\sqrt{2}\Leftrightarrow x-5=3+2\sqrt{2}=\left(\sqrt{2}+1\right)^2\\ \Leftrightarrow B-2=2\left(\sqrt{2}+1\right)-2=2\sqrt{2}+2-2=2\sqrt{2}\)
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