Завдання 1101 - 1200 » 1110

Виконай дії: 1) 15/6 + (–24/9) + (–5/8) + 27/12 = 15/6 + 27/12 + ((–24/9) + (–5/8)) = 3(10 + 7)/12 + (–2(32 + 45)/72) = 317/12 + (–277/72) = 45/12 + (–35/72) = 1(30 - 5)/72 = 125/72; 2) –74/9 + 63/4 + (–25/12) = –74/9 + (–25/12) + 63/4 = –9(16 + 15)/36 + 63/4 = –931/36 + 63/4 = – (931/36 – 63/4) = –3(31 - 27)/36 = –34/36 = –31/9; 3) –21/5 + 921/25 + (–57/10) = –21/5 + (–57/10) + 921/25 = –7(2 + 7)/10 + 921/25 = –79/10 + 921/25 = 921/25 – 79/10 = 846/25 – 79/10 = 1(184 - 90)/100 = 194/100 = 147/50; 4) –42,08 + (–62/5) + (–73/4) = –(42,08 + 6,4 + 7,75) = –56,23; 5) –5,1 + (–33/10) + 51/3 + (–0,7) = –5,1 + (–3,3) + (–0,7) + 51/3 = –9,1 + 51/3 = –(91/10 – 51/3) = –(811/10 – 51/3) = –3(33 - 10)/30 = –323/30; 6) –32/5 + (–8,75) + 153/10 + (–68/15) = –32/5 + (–83/4) + (–68/15) + 153/10 = = –17(24 + 45 + 32)/60 + 153/10 = –17101/60 + 153/10 = –1841/60 + 153/10 = –(1841/60 – 153/10) = –3(41 - 18)/60 = –323/60.