а)4 1/30 - 3 1/20=4 2/60-3 3/60 = 3 62/60-3 3/60 = 59/60
б)14 1/12-1 1/18= 14 3/36-1 2/36=12 1/36
в)3 9/25- 1 7/10 =3 18/50-1 35/50=2 68/50-1 35/50 = 1 33/50
г)13 1/24-1 11/18 =13 3/72-1 33/72 = 12 75/72-1 33/72=11 42/72=11 7/12
д)13 1/18-10 1/12=13 2/36-10 3/36 = 12 38/36-10 3/36= 2 35/36
е)16 2/25 - 12 2/15=16 6/75 - 12 30/75 =15 81/75-12 30/75= 3 51/75=3 17/25.