[tex] \sqrt{ \frac{36}{16+9} }= \sqrt{ \frac{36}{25} }= \frac{6}{5}
[/tex]
[tex] \sqrt{ \frac{64*50*2}{64/4*9} }= \sqrt{ \frac{64*100}{64/36} }= \frac{8*10}{8/6} [/tex]
[tex]\frac{8*10}{8/6}=80: \frac{8}{6}=80* \frac{6}{8}=10* \frac{6}{1}= \frac{60}{1} [/tex]
[tex] \frac{6}{5}: \frac{60}{1}= \frac{6}{5}* \frac{1}{60}= \frac{1}{5}* \frac{1}{10}= \frac{1}{50} [/tex]