А) 1 6/19 + 2 1/38= 1 12/38+ 2 1/38 = 3 13/38
б)8 3/11- 5 1/22= 3 3/11- 1/22= 3 6/22-1/22 = 3 5/22
в) 1 6/15-22/45= 1 18/45-22/45= 63/45-22/45=41/45
г) 2-1 4/7= 1-4/7= 7/7-4/7= 3/7
д)4 3/4- (3/11+2 1/77)= 3/11+ 2 1/77= 2 21/77+1/77=4 3/4-2 22/77= 2 3/4 - 22/77= 2 231/308-88/308= 2 143/308
е) 2 3/8 + 1,25= 2 3/8 + 1 25/100= 3 + (300/800 + 120/800)= 3+ 420/800= 3 420/800= 3 210/ 400