45 : 5;
99 : 33;
80 : 16;
78 : 6 * 3;
51 : 3 * 4;
84 : 4 * 3;
100 − 2 * 18;
100 − 3 * 18;
100 − 4 * 18;
(34 + 36) : 10;
(75 − 33) : 3;
(82 − 16) : 33.
45 : 5 = 9;
99 : 33 = 3;
80 : 16 = 5;
78 : 6 * 3 = (60 + 18) : 6 * 3 = (60 : 6 + 18 : 6) * 3 = (10 + 3) * 3 = 10 * 3 + 3 * 3 = 30 + 9 = 39;
51 : 3 * 4 = (30 + 21) : 3 * 4 = (30 : 3 + 21 : 3) * 4 = (10 + 7) * 4 = 10 * 4 + 7 * 4 = 40 + 28 = 68;
84 : 4 * 3 = (80 + 4) : 4 * 3 = (80 : 4 + 4 : 4) * 3 = (20 + 1) * 3 = 20 * 3 + 1 * 3 = 60 + 3 = 63;
100 − 2 * 18 = 100 − 2 * (10 + 8) = 100 − (2 * 10 + 2 * 8) = 100 − (20 + 16) = 100 − 36 = 64;
100 − 3 * 18 = 100 − 3 * (10 + 8) = 100 − (3 * 10 + 3 * 8) = 100 − (30 + 24) = 100 − 54 = 46;
100 − 4 * 18 = 100 − 4 * (10 + 8) = 100 − (4 * 10 + 4 * 8) = 100 − (40 + 32) = 100 − 72 = 28;
(34 + 36) : 10 = 70 : 10 = 7;
(75 − 33) : 3 = 42 : 3 = (30 + 12) : 3 = 30 : 3 + 12 : 3 = 10 + 4 = 14;
(82 − 16) : 33 = 66 : 33 = 2.