\sqrt(x^(2)-3x+8)-1=x

(2\sqrt(3)-3\sqrt(2))/(\sqrt(3)-\sqrt(2))+(5)/(1+\sqrt(6))-6\sqrt((1)/(6))

A=((\sqrt(x))/(x-9)+(2)/(\sqrt(x)+3)+(3)/(3-\sqrt(x)))-:(\sqrt(x)-3+(12-x)/(\sqrt(x)+3)) với điều kiện x=0 , x≠9

((2+\sqrt(a))^(2)-(\sqrt(a)-3)^(2))/(2a-\sqrt(a))