\(A=\dfrac{3x+3\sqrt{x}-3+\sqrt{x}+2+\sqrt{x}-1}{\left(\sqrt{x}+2\right)\left(\sqrt{x}-1\right)}\cdot\dfrac{x-1}{1}\)
\(=\dfrac{3x+5\sqrt{x}-2}{\left(\sqrt{x}+2\right)}\cdot\dfrac{\sqrt{x}+1}{1}\)
\(=\dfrac{\left(\sqrt{x}+2\right)\left(3\sqrt{x}-1\right)}{\left(\sqrt{x}+2\right)}\cdot\left(\sqrt{x}+1\right)\)
=(3căn x-1)(căn x+1)
=3x+2*căn x-1