Номер 781

52 : 4 = (40 + 12) : 4 = 40 : 4 + 12 : 4 = 10 + 3 = 13;
62 : 2 = (60 + 2) : 2 = 60 : 2 + 2 : 2 = 30 + 1 = 31;
39 : 3 = (30 + 9) : 3 = 30 : 3 + 9 : 3 = 10 + 3 = 13;
45 : 3 = (30 + 15) : 3 = 30 : 3 + 15 : 3 = 10 + 5 = 15;
42 : 3 = (30 + 12) : 3 = 30 : 3 + 12 : 3 = 10 + 4 = 14;
92 : 4 = (80 + 12) : 4 = 80 : 4 + 12 : 4 = 20 + 3 = 23;
56 : 8 = (40 + 16) : 8 = 40 : 8 + 16 : 8 = 5 + 2 = 7;
80 : 5 = (50 + 30) : 5 = 50 : 5 + 30 : 5 = 10 + 6 = 16;
84 : 7 = (70 + 14) : 7 = 70 : 7 + 14 : 7 = 10 + 2 = 12;
75 : 5 = (50 + 25) : 5 = 50 : 5 + 25 : 5 = 10 + 5 = 15.