\(B=\dfrac{\sqrt{x}\left(\sqrt{x}+1\right)-x\sqrt{x}-\sqrt{x}+1}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)}\)
\(=\dfrac{x+\sqrt{x}-x\sqrt{x}-\sqrt{x}+1}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)}=\dfrac{-x\sqrt{x}+x+1}{x-1}\)
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