Завдання 501 - 600 » 533

Обчисліть: 1) 123/45 : (32/5 – 12/15) = 123/45 : (36/15 – 12/15) = 123/45 : 24/15 = 68/45 ∙ 15/34 = 2/3; 2) 62/3 : (35/48 : 21/32) = 62/3 : (35/48 ∙ 32/21) = 62/3 : 10/9 = 20/3 ∙ 9/10 = 2 ∙ 3 = 6; 3) 11/9 ∙ (1 – 2/5) : 8/21 = 10/9 ∙ (5 - 2)/5 ∙ 21/8 = 10/9 ∙ 3/5 ∙ 21/8 = 1/1 ∙ 1/1 ∙ 7/4 = 13/4.