2.131 Запишите в виде десятичной дроби: a) $$rac{2}{4}$$, $$rac{2}{5}$$, $$rac{30}{50}$$. б) $$rac{1}{4}$$, $$rac{17}{20}$$, $$rac{9}{25}$$, $$rac{49}{50}$$. в) $$rac{3}{8}$$, $$rac{13}{125}$$, $$rac{161}{250}$$, $$rac{173}{500}$$

a) $$rac{2}{4} = 0,5$$, $$rac{2}{5} = 0,4$$, $$rac{30}{50} = 0,6$$.

б) $$rac{1}{4} = 0,25$$, $$rac{17}{20} = 0,85$$, $$rac{9}{25} = 0,36$$, $$rac{49}{50} = 0,98$$.

в) $$rac{3}{8} = 0,375$$, $$rac{13}{125} = 0,104$$, $$rac{161}{250} = 0,644$$, $$rac{173}{500} = 0,346$$.