Вправи 401 - 500 » 425

Знайдіть значення виразу: 1) (25/9 – 120/21) : 18/49 + 18/9 : 6 = (14/9 – 20/21) : 57/49 + 17/9 ∙ 1/6 = (14 • 7 - 20 • 3)/63 ∙ 49/57 + 17/9 ∙ 1/6 = 38/63 ∙ 49/57 + 17/54 = 2/9 ∙ 7/3 + 17/54 = 14/27 + 17/54 = (14 • 2 + 17)/54 = 45/54 = 5/6; 2) (117/18 ∙ 113/14 – 25/8 : 119/20) : (225/78 – 11/26) = (35/18 ∙ 27/14 – 21/8 ∙ 20/39) : 1(25 - 1 • 3)/78 = (5/2 ∙ 3/2 – 7/2 ∙ 5/13) ∙ 78/100 = (15 • 13 - 35 • 2)/52 ∙ 39/50 = 125/52 ∙ 39/50 = 5/4 ∙ 3/2 = 17/8.