2.131 Запишите в виде десятичной дроби: а) 2/4, 2/5, 30/50; б) 1/4, 17/20, 9/25, 49/50; в) 3/8, 13/125, 161/250, 173/500.

а) \(\frac24=0.5\), \(\frac25=0.4\), \(\frac{30}{50}=0.6\).

б) \(\frac14=0.25\), \(\frac{17}{20}=0.85\), \(\frac9{25}=0.36\), \(\frac{49}{50}=0.98\).

в) \(\frac38=0.375\), \(\frac{13}{125}=0.104\), \(\frac{161}{250}=0.644\), \(\frac{173}{500}=0.346\).

Ответ: а) 0.5; 0.4; 0.6. б) 0.25; 0.85; 0.36; 0.98. в) 0.375; 0.104; 0.644; 0.346.