Ответ:

  1. \(\frac{9}{25}=\frac{9\cdot4}{25\cdot4}=\frac{36}{100}=0{,}36\).

  2. \(\frac{5}{8}=\frac{5\cdot125}{8\cdot125}=\frac{625}{1000}=0{,}625\).

  3. \(\frac{121}{50}=\frac{121\cdot2}{50\cdot2}=\frac{242}{100}=2{,}42\).

Ответ: 0,36; 0,625; 2,42.