Вправи 301 - 400 » 326

Знайдіть значення виразу: 1) (11/18 – 4/9) ∙ 3/16 = (11 - 4 • 2)/18 ∙ 3/16 = 3/18 ∙ 3/16 = (1 • 1)/(2 • 16) = 1/32; 2) 11/18 – 4/9 ∙ 3/16 = 11/18 – (1 • 1)/(3 • 4) = 11/18 – 1/12 = (11 • 2 - 1 • 3)/36 = 19/36; 3) 13/5 ∙ (3/4 + 13/8) = 8/5 ∙ (6/8 + 11/8) = 8/5 ∙ 17/8 = 32/5; 4) 13/5 ∙ 3/4 + 13/8 = 8/5 ∙ 3/4 + 11/8 = 6/5 + 11/8 = (48 + 55)/40 = 103/40 = 223/40; 5) 13/25 ∙ 21/7 – 21/9 ∙ 27/190 = 28/25 ∙ 15/7 – 19/9 ∙ 27/190 = (4 • 3)/(5 • 1) – (1 • 3)/(1 • 10) = 12/5 – 3/10 = (12 • 2 - 3)/10 = 21/10 = 21/10; 6) (8 – 21/7 ∙ 31/9) ∙ 27/44 = (8 – 15/7 ∙ 28/9) ∙ 27/44 = (8 – (5 • 4)/(1 • 3)) ∙ 27/44 = (8 – 20/3) ∙ 27/44 = 4/3 ∙ 27/44 = (1 • 9)/(1 • 11) = 9/11.