Вправи 301 - 400 » 321

Знайдіть добуток: 1) 6/11 ∙ 4/7 = 24/77; 2) 7/(20 ) ∙ 10/21 = (1 • 1)/(2 • 3) = 1/6; 3) 8/9 ∙ 27/32 = (1 • 3)/(1 • 4) = 3/4; 4) 23/28 ∙ 49/46 = (1 • 7)/(4 • 2) = 7/8; 5) 34/86 ∙ 43/51 = (2 • 1)/(2 • 3) = 1/3; 6) 7/18 ∙ 90/77 = (1 • 10)/(2 • 11) = 5/11; 7) 63/64 ∙ 48/91 = (9 • 3)/(4 • 13) = 27/52; 8) 19/100 ∙ 5/38 = (1 • 1)/(20 • 2) = 1/40.