А) 5 6/55 + 3 9/44 - 4 7/22; б) 2 9/26 + 3 7/39 - 4 7/13; в) (25 13/27 + 12 4/19) + (13 15/18 + 21 5/9); г) (13 22/35 + 21 5/21) + (12 16/21 + 24 3/7)

Пошаговое объяснение:

а) 5 6/55 + 3 9/44 - 4 7/22 = 281/55 + 141/44 - 95/22 =  (1124 + 705 - 950) / 220 = 879/220 = 3 219/220

б) 2 9/26 + 3 7/39 - 4 7/13 = 61/26 + 124/39 - 59/13 = (183 + 248 - 354) / 78 = 77/78

в) (25 13/27 + 12 4/19) + (13 15/18 + 21 5/9) = (688/27 + 232/19) + (249/18 + 194/9) = 73 83/1026

688/27 + 232/19 = (13072 + 6264) / 513 = 19336/513

249/18 + 194/9 = (249 + 388) / 18 = 637/18

19336/513 + 637/18 = (38672 + 36309) / 1026 = 74981/1026 = 73 83/1026

г) (13 22/35 + 21 5/21) + (12 16/21 + 24 3/7) = (477/35 + 446/21) + (268/21 + 171/7)=

477/35 + 446/21 = (1431 + 2230) / 105 = 3661/105 = 523/15

268/21 + 171/7 = (268 + 513) / 21 = 781/21

523/15 + 781/21= (3661+3905) / 105 = 7566/105 = 2522/35 = 72 2/35