Завдання 401 - 500 » 454

Обчисліть: 1) 1/6 ∙ 11/5 = 1/6 ∙ 6/5 = 1/5; 2) 5/11 ∙ 31/8 = 5/11 ∙ 25/8 = 125/88 = 137/88; 3) 21/7 ∙ 7/25 = 15/7 ∙ 7/25 = 3/5; 4) 22/11 ∙ 13/24 = 24/11 ∙ 13/24 = 13/11 = 12/11; 5) 3/8 ∙ 13/5 = 3/8 ∙ 8/5 = 3/5; 6) 7/12 ∙ 11/14 = 7/12 ∙ 15/14 = (1 • 5)/(4 • 2) = 5/8; 7) 31/3 ∙ 9/25 = 10/3 ∙ 9/25 = (2 • 3)/(1 • 5) = 6/5 = 11/5; 8) 33/7 ∙ 35/48 = 24/7 ∙ 35/48 = (1 • 5)/(1 • 2) = 5/2 = 21/2.