\(Q=\left[\frac{\sqrt{x}^3-1}{\sqrt{x}\left(\sqrt{x}-1\right)}-\frac{\sqrt{x}^3+1}{\sqrt{x}\left(\sqrt{x}+1\right)}\right]:\frac{2\left(\sqrt{x}-1\right)^2}{\left(\sqrt{x}+1\right)\left(\sqrt{x}-1\right)}\)
\(=\left[\frac{\left(\sqrt{x}-1\right)\left(x^2+x+1\right)}{\sqrt{x}\left(\sqrt{x}-1\right)}-\frac{\left(\sqrt{x}+1\right)\left(x^2-x+1\right)}{\sqrt{x}\left(\sqrt{x}+1\right)}\right]:\frac{2\left(\sqrt{x}-1\right)}{\sqrt{x}+1}\)
\(=\left(\frac{x^2+x+1}{\sqrt{x}}-\frac{x^2-x+1}{\sqrt{x}}\right).\frac{\sqrt{x}+1}{2\left(\sqrt{x}-1\right)}\)
\(=\frac{2x}{\sqrt{x}}.\frac{\sqrt{x}+1}{2\left(\sqrt{x}-1\right)}=\frac{\sqrt{x}\left(\sqrt{x}+1\right)}{\sqrt{x}-1}\)