ĐKXĐ :
\(a-\sqrt{a}+1\ne0\)
\(\sqrt{a}>0\)
\(A=\frac{a^2+\sqrt{a}}{a-\sqrt{a}+1}-\frac{2a+\sqrt{a}}{\sqrt{a}}\)
\(=\frac{\left(\sqrt{a}+1\right)\left(a-\sqrt{a}+1\right)}{a-\sqrt{a}+1}-\frac{\sqrt{a}\left(2\sqrt{a}+1\right)}{\sqrt{a}}\)
\(=\sqrt{a}+1-2\sqrt{a}-1\)
\(=-\sqrt{a}\)