Завдання 1001 - 1100 » 1074

Обчисли значення виразу: 1) 47/8 + (–31/9) = 47/8 – 31/9 = 1(63 - 8)/72 = 155/72; 2) –42/7 + (–51/3) = –9(6 + 7)/21 = –913/21; 3) –72/9 + 35/6 = –(72/9 – 35/6) = –(611/9 – 35/6) = –3(22 - 15)/18 = –37/18; 4) –12 + 98/11 = –(12 – 98/11) = –(1111/11 – 98/11) = –23/11; 5) –13/10 + 2,7 = –1,3 + 2,7 = 1,4; 6) –5,25 + 43/4 = –5,25 + 4,75 = –(5,25 – 4,75) = –0,5; 7) 2,81 + (–17/10) = 2,81 + (–1,7) = 1,11; 8) 18/9 + (–2,05) = 18/9 + (–21/20) = –(21/20 – 18/9) = –(121/20 – 18/9) = –(189 - 160)/180 = – 29/180.