$a)\sqrt{\frac{49}{169}}=\frac{7}{13}$  

$b)\sqrt{\frac{121}{144}}=\frac{11}{12}$ $b)\sqrt{\frac{121}{144}}=\frac{11}{12}$  

$c)\sqrt{1\frac{9}{16}}=\sqrt{\frac{25}{16}}=\frac{5}{4}=1\frac{1}{4}$  

$d)\sqrt{2\frac{14}{25}}=\sqrt{\frac{64}{25}}=\frac{8}{5}=1\frac{3}{5}$  

$e)\sqrt{0,09}=0,3$  

$f)\sqrt{1,69}=1,3$  

$g)\sqrt{6+\sqrt{7+\sqrt{4}}}=\sqrt{6+\sqrt{7+2}}=\sqrt{6+\sqrt{9}}=\sqrt{6+3}=\sqrt{9}=3$  

$h)\sqrt{6-\sqrt{6-\sqrt{4}}}=\sqrt{6-\sqrt{6-2}}=\sqrt{6-\sqrt{4}}=\sqrt{6-2}=\sqrt{4}=2$