1: Khi x=1/4 thì \(A=\dfrac{\left(\dfrac{1}{2}+2\right)}{2\cdot\dfrac{1}{4}+1}=\dfrac{5}{2}:\dfrac{3}{2}=\dfrac{5}{3}\)
2: \(B=\dfrac{x-\sqrt{x}-2-2\sqrt{x}-4+6+\sqrt{x}}{x-4}\)
\(=\dfrac{x-2\sqrt{x}}{x-4}=\dfrac{\sqrt{x}}{\sqrt{x}+2}\)
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