а) 1/11 - 1/33 = (3/33) - (1/33) = 2/33
б) 7/11 - 5/8 = (56/88) - (55/88) = 1/88
в) 13/30 - 2/45 = (39/90) - (4/90) = 35/90 = 7/18
г) 13/60 - 7/40 = (13/60) - (21/120) = (26/120) - (21/120) = 5/120 = 1/24
а) 1/11 - 1/33 = (3/33) - (1/33) = 2/33
б) 7/11 - 5/8 = (56/88) - (55/88) = 1/88
в) 13/30 - 2/45 = (39/90) - (4/90) = 35/90 = 7/18
г) 13/60 - 7/40 = (13/60) - (21/120) = (26/120) - (21/120) = 5/120 = 1/24