Вправи 401 - 500 » 412

Знайдіть значення виразу: 1) 12 : 33/8 – 11/4 : 15/32 = 12 ∙ 8/27 – 5/4 ∙ 32/15 = 32/9 – 8/3 = (32 - 8 • 3)/9 = 8/9; 2) 131/35 : (2 – 8/9 : 116/45) = 66/35 : (2 – 8/9 ∙ 45/64) = 66/35 : (2 – 5/8) = 66/35 : 11/8 = 66/35 ∙ 8/11 = 48/35 = 113/35; 3) (11/35 : 4/5 – 18/35) ∙ 31/3 = (36/35 ∙ 5/4 – 43/35) ∙ 10/3 = 2/35 ∙ 10/3 = 4/21; 4) (7 – 15/9 : 7/24) : 20/27 = (7 – 14/9 ∙ 24/7) ∙ 27/20 = (7 – 16/3) ∙ 27/20 = (7 – 51/3) ∙ 27/20 = 5/3 ∙ 27/20 = 9/4 = 21/4.