Вправи 301 - 400 » 320

Знайдіть добуток: 1) 2/7 ∙ 3/5 = 6/35; 2) 3/4 ∙ 5/6 = 5/8; 3) 4/7 ∙ 7/9 = 4/9; 4) 15/16 ∙ 48/55 = 9/11; 5) 22/25 ∙ 10/77 = (2 • 2)/(5 • 5) = 4/25; 6) 13/24 ∙ 16/39 = (1 • 2)/(3 • 3) = 2/9; 7) 6/35 ∙ 14/15 = (2 • 2)/(5 • 5) = 4/25; 8) 36/85 ∙ 34/39 = (12 • 2)/(5 • 13) = 24/65.