ПОМОГИТЕ ВЫПОЛНИТЬ!!!!!!!!!!!!!!
1) (31+21+11) / 60 = 63/60 = 1 1/20 2) (53-9-42) / 54 = 2/54 = 1/27 3) (13+23-10) / 35 = 26/35 4) (7-12+5) / 16 = 0