1 + 13 × 1 : 1 + 1 + 12 × 1 – 3 – 11 + 7 × 9 : 1 – 10 = 66
(a = 1, b = 1, c = 1, d = 1, e = 1, f = 3, g = 7, h = 9, i = 1)
còn các đáp án khác như là:
3 + 13 × 2 : 1 + 5 + 12 × 4 – 7 – 11 + 8 × 9 : 6 – 10 = 66
5 + 13 × 3 : 1 + 7 + 12 × 2 – 6 – 11 + 8 × 9 : 4 – 10 = 66
5 + 13 × 9 : 3 + 6 + 12 × 2 – 1 – 11 + 7 × 8 : 4 – 10 = 66
5 + 13 × 4 : 1 + 9 + 12 × 2 – 7 – 11 + 3 × 8 : 6 – 10 = 66
6 + 13 × 3 : 1 + 9 + 12 × 2 – 5 – 11 + 7 × 8 : 4 – 10 = 66