Вправи 1101 - 1200 » 1114

Знайдіть значення виразу: 1) –12 : (–21/13) + 11/4 : (–15/46) = –12 ∙ (–13/27) + 5/4 ∙ (–46/15) = 52/9 – 23/6 = 57/9 – 35/6 = 432/18 – 315/18 = 117/18. 2) (9/20 – 7/8) : (–7/45 – 2/9) = (18/40 – 35/40) : (–7/45 – 10/45) = – 17/40 : (–17/45) = 17/40 ∙ 45/17 = 9/8 = 11/8.