19 − 16 = 9 × 4 = 1 × 10 = 10 × 4 =
1 × 4 = 2 × 3 = 8 × 10 = 5 × 4 =
4 × 1 = 0 × 1 = 7 − 4 = 7 × 4 =
17 − 1 = 4 × 10 = 9 × 1 = 20 − 19 =
4 × 5 = 4 × 3 = 4 × 2 = 19 − 19 =
2 × 1 = 13 − 12 = 3 × 4 = 6 × 1 =
15 − 9 = 7 × 5 = 15 − 1 = 12 − 9 =
8 × 3 = 7 × 2 = 0 × 5 = 3 × 5 =
15 − 3 = 17 − 3 = 5 × 3 = 2 × 5 =
3 × 10 = 18 − 8 = 14 − 11 = 10 × 10 =
12 − 7 = 0 × 4 = 6 × 3 = 8 − 5 =
18 − 15 = 9 × 10 = 15 − 2 = 14 − 10 =
6 − 4 = 15 − 6 = 19 − 15 = 20 − 16 =
14 − 8 = 1 × 2 = 15 − 13 = 20 − 4 =
20 − 13 = 12 − 10 = 19 − 12 = 15 − 11 =