Розділ 2. Вирази і тотожності » 2

Знайдіть значення виразу: 1) 18 – 105/6 • 113/35 + 65/14 = 18 – 65/6 • 48/35 + 65/14 = 18 – 104/7 + 65/14 = 245/14 – 146/7 = 245/14 – 1412/14 = 2319/14 – 1412/14 = 97/14 = 91/2 = 9,5; 2) 54/7 • 29/13 – 12/3 : (42/9 – 25/6) = 39/7 • 35/13 – 12/3 : (44/18 – 215/18) = 15 – 12/3 : (322/18 – 215/18) = 15 – 12/3 : 17/18 = 15 – 5/3 : 25/18 = 15 – 5/3 • 18/25 = 15 – 6/5 = 15 – 11/5 = 134/5 = 13,8; 3) (32/3 – 12/7 • 54/9) : (–2,5) = (32/3 – 9/7 • 49/9) : (–2,5) = (32/3 – 7) : (–2,5) = –31/3 : (–25/10) = –10/3 • (–10/25) = 100/75 = 4/3 = 11/3; 4) 0,6 • 5/6 – (35/9 – 22/15) : 9,6 = 6/10 • 5/6 – (325/45 – 26/45) : 96/10 = 1/2 – 119/45 : 96/10 = 1/2 – 64/45 • 10/96 = 1/2 – 4/27 = (27-8)/54 = 19/54.