Предмет: математика.
a)
$$\frac{2}{4} = 0.5$$
$$\frac{2}{5} = 0.4$$
$$\frac{30}{50} = 0.6$$
б)
$$\frac{1}{4} = 0.25$$
$$\frac{17}{20} = 0.85$$
$$\frac{9}{25} = 0.36$$
$$\frac{49}{50} = 0.98$$
в)
$$\frac{3}{8} = 0.375$$
$$\frac{13}{125} = 0.104$$
$$\frac{161}{250} = 0.644$$
$$\frac{173}{500} = 0.346$$