Вправи 301 - 400 » 327

Знайдіть значення виразу: 1) 154/9 – 44/9 ∙ 33/8 = 154/9 – 40/9 ∙ 27/8 = 154/9 – (5 • 3)/(1 • 1) = 154/9 – 15 = 4/9; 2) 81/88 ∙ (6 – 113/15 ∙ 119/21) = 81/88 ∙ (6 – 28/15 ∙ 40/21) = 81/88 ∙ (6 – (4 • 8)/(3 • 3)) = 81/88 ∙ (6 – 32/9) = 81/88 ∙ 22/9 = (9 • 1)/(4 • 1) = 21/4; 3) (51/16 – 11/8) ∙ (5/6 + 3/14) = (417/16 – 12/16) ∙ (5 • 7 + 3 • 3)/42 = 315/16 ∙ 44/42 = 63/16 ∙ 44/42 = (3 • 11)/(4 • 2) = 33/8 = 41/8; 4) 51/16 – 11/8 ∙ (5/6 + 3/14) = 51/16 – 11/8 ∙ (5 • 7 + 3 • 3)/42 = 51/16 – 9/8 ∙ 44/42 = 51/16 – (3 • 11)/(2 • 14) = 51/16 – 33/28 = 417/16 – 15/28 = 3 + (17 • 7 - 5 • 4)/112 = 399/112.