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