Tìm x,y,z biết 

Tìm x,y,z biết 

\(\dfrac{1}{6}\)

Rút gọn 

A=\(\left(\dfrac{5\sqrt[]{x}-6}{x-9}-\dfrac{2}{\sqrt{x}+3}\right):\left(1+\dfrac{6}{x-9}\right)\)

\(\sqrt{9\left(x-1\right)}=12\)

\(\Leftrightarrow3\sqrt{\left(x-1\right)^2}=12\)

\(\Leftrightarrow x-1=4\)

\(\Leftrightarrow x=5\)