Завдання 501 - 600 » 522

Обчисли: 1) (2/3 + 11/7 · 7/18) : 5 = (2/3 + (8 ∙ 7)/(7 ∙ 18)) : 5 = (2/3 + 4/9) : 5 = (6 + 4)/9 : 5 = 10/9 : 5 = (10 ∙ 1)/(9 ∙ 5) = 2/9; 2) (13/50 – 0,05) · 34/7 = (13/50 – 1/20) · 34/7 = (26 - 5)/100 ∙34/7 = 21/100 · 25/7 = (21 ∙ 25)/(100 ∙ 7) = 3/4.