/571 а) (3/16+1/4)*8 б) (5/9+2/3)÷11 в) (7/8 - 5/24)×48 г) (9/13 - 9/39)÷9 д) (4/15 - 1/5)×25 е) (7/12+5/36)÷13

а) (3/16+1/4)*8 = 8/16 + 8/4 = 2 1/2;б) (5/9+2/3)÷11 = (5/9 + 6/9) / 11 = (11/9) / 11 = 1/9;в) (7/8 - 5/24)×48 = (21/24 – 5/24) * 48 = 16 * 48 / 24 = 32;г) (9/13 - 9/39)÷9 = (27/39 – 9/39) / 9 = (18/39) / 9 = 2/39;д) (4/15 - 1/5)×25 = (4/15 – 3/15) * 25 = 25/15 = 5/3 = 2 2/3;е) (7/12+5/36)÷13 = (21/36 + 5/36) / 13 = (26/36) / 13 = 2/36 = 1/18;