a: \(A=\dfrac{x-\sqrt{x}+\sqrt{x}-4+3\sqrt{x}+3}{x-1}\)
\(=\dfrac{x+3\sqrt{x}+1}{x-1}\)
b: KHi x=2 thì \(A=\dfrac{2+3\sqrt{2}+1}{2-1}=3+3\sqrt{2}\)
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