Ответ:

a)

  • $$\frac{2}{4} = 0.4$$
  • $$\frac{2}{5} = 0.4$$
  • $$\frac{30}{50} = 0.6$$

б)

  • $$\frac{1}{4} = 0.25$$
  • $$\frac{17}{20} = 0.85$$
  • $$\frac{9}{25} = 0.36$$
  • $$\frac{49}{50} = 0.98$$

в)

  • $$\frac{13}{8} = 1.625$$
  • $$\frac{161}{125} = 1.288$$
  • $$\frac{173}{250} = 0.692$$
  • $$\frac{4}{500} = 0.008$$

Ответ: a) 0.4, 0.4, 0.6; б) 0.25, 0.85, 0.36, 0.98; в) 1.625, 1.288, 0.692, 0.008.