Вычислите, используя законы сложения: а)11/48+13/48/17/48 б)19/55+18/55+12/55 в)25/64+17/64+15/64 г)23/69+38/69+7/69 д)28/43+52/43+19/43 е)17/45+11/45+23/45 ж)1/45+2/45+7/45

Вычислим:

а) 11/48 + 13/48 + 17/48 = (11 + 13 + 17)/48 = 41/48;

б) 19/55 + 18/55 + 12/55 = (19 + 18 + 12)/56 = 59/56 = 1 3/59;

в) 25/64 + 17/64 + 15/64 = (25 + 17 + 15)/64 = 57/64;

г) 23/69 + 38/69 + 7/69 = (23 + 38 + 7)/69 = 68/69;

д) 28/43 + 52/43 + 19/43 = (28 + 52 + 19)/43 = 99/43 = 2 13/43;

е) 17/45 + 11/45 + 23/45 = (17 + 11 + 23)/45 = 51/45 = 1 6/45 = 1 2/15;

ж) 1/45 + 2/45 + 7/45 = (1 + 2 + 7)/45 = 10/45 = 2/9;

з) 13/44 + 15/44 + 17/44 = (13 + 15 + 17)/44 = 45/44 = 1 1/44;

и) 16/77 + 8/77 + 4/77 = (16 + 8 + 4)/77 = 28/77 = 4/11.