Giải PT sau

\(\sqrt{25x-25}-\dfrac{15}{2}\sqrt{\dfrac{x-1}{9}}=6+\sqrt{x-1}\) 

\(c\sqrt{20}-\sqrt{45}+3\sqrt{8}+\sqrt{72}\) 

\(d.\dfrac{3}{\sqrt{3}+1}\) 

\(f.\dfrac{2}{\sqrt{10}+\sqrt{7}}\)

\(b.\dfrac{3\sqrt{3}-1}{\sqrt{3}+\sqrt{2}}\)

a. Rút gọn M = \(\left(\dfrac{1}{a-\sqrt{a}}+\dfrac{1}{\sqrt{a}-1}\right):\dfrac{\sqrt{a}+1}{a-2\sqrt{a}+1}\)