Відповіді до завдань 802 - 900 » 892

35/21 + 44/21 = (3 + 4) + (5/21 + 4/21) = 7 + 9/21 = 79/21; 2) 313/19 + 814/19 = (3 + 8) + (13/19 + 14/19) = 11 + 27/19 = 12 + 8/19 =128/19; 3) 615/17 + 42/17 = (6 + 4) + (15/17 + 2/17) = 10 + 17/17 = 10 + 1 = 11; 4) 52/9 + 48/9 = (5 + 4) + (2/9 + 8/9) = 9 + 10/9 = 9 + (9+1)/9 = 9 + 1 + 1/9 = 101/9; 5) 712/15 + 413/15 = (7 + 4) + (12/15 + 13/15) = 11 + 25/15 = 11 + 1 + 10/15 = 1210/15; 6) 911/13 + 812/13 = (9 + 8) + (11/13 + 12/13) = 17 + 23/13 = 17 + (13+ 10)/13 = 17 + + 1 + 10/13 =1810/13. Відповідь: 1) 79/21; 2) 128/19; 3) 11; 4) 101/9; 5) 1210/15; 6) 1810/13.