Завдання 1001 - 1100 » 1036

Обчисли суму: 1) –13/5 + (–25/6) = –3(18 + 25)/30 = –343/30 = –413/30; 2)–57/15 + (–83/10) = –13(14 + 9)/30 = –1323/30; 3) –49/14 + (–24/21) = –6(27 + 8)/42 = –635/42 = –65/6; 4) –0,85 + (–41/2) = –0,85 + (–4,5) = –5,35; 5) –43/10 + (–1,2) = –4,3 + (–1,2) = –5,5; 6) –5,15 + (– 21/4) = –5,15 + (–2,25) = –7,4.