Завдання 1101 - 1200 » 1111

Знайди значення виразу: 1) 12/3 + (–17/8) + 5/6 + (–27/12) = 12/3 + 5/6 + ((–17/8) + (–27/12)) = 1(4 + 5)/6 + (–3(21 + 14)/24) = 21/2 + (–335/24) = 21/2 + (–411/24) = –(335/24 – 21/2) = –1(35 - 12)/24 = –123/24; 2) 11/2 + (–172/5) + 123/4 = 11/2 + 123/4 + (–172/5) = 13(2 + 3)/4 + (–172/5) = –(172/5 – 141/4) = –3(8 - 5)/20 = –33/20. 3) –33/7 + 79/14 + (–45/21) = (–33/7 + (–45/21)) + 79/14 = –7(9 + 5)/21 + 79/14 = –714/21 + 79/14 = –72/3 + 79/14 = – 28/42 + 27/42 = – 1/42; 4) –1,3 + (–17/10) + 32/3 = –1,3 + (–1,7) + 32/3 = –3 + 32/3 = 2/3; 5) –2,5 + 15/6 + (–21/6) + (–3,7) = –2,5 + (–3,7) + (15/6 + (–21/6)) = –6,2 + (–(21/6 – 15/6)) = –6,2 + (– 1/3) = –61/5 + (–1/3) = –68/15; 6) 5,2 + (–47/16) + 53/80 + (–4,7) = (51/5 + 53/80) + (–47/16 + (–47/10)) = 10(16 + 3)/80+ (–8(35 + 56)/80) = 1019/80 + (–891/80) = 1019/80 + (–911/80) = 18/80 = 11/10.