\(B=\dfrac{x\sqrt{x}+x+x}{\sqrt{x}\left(\sqrt{x}+1\right)}\cdot\dfrac{\sqrt{x}\left(\sqrt{x}+1\right)}{\sqrt{x}}\)
\(=\dfrac{2x+x\sqrt{x}}{\sqrt{x}}=x+2\sqrt{x}\)
\(C=\dfrac{x+\sqrt{x}+3\sqrt{x}-3-6\sqrt{x}+4}{x-1}\)
\(=\dfrac{x-2\sqrt{x}+1}{x-1}=\dfrac{\sqrt{x}-1}{\sqrt{x}+1}\)