9 加法 9 等于多少？

9 + 8 = 17 9 + 10 = 19 9 + 11 = 20 9 + 7 = 16 9 + 12 = 21 9 + 6 = 15 9 + 13 = 22 9 + 5 = 14 8 + 9 = 17 10 + 9 = 19 11 + 9 = 20 7 + 9 = 16 12 + 9 = 21 6 + 9 = 15 13 + 9 = 22 5 + 9 = 14 1 + 17 = 18 2 + 16 = 18 3 + 15 = 18 4 + 14 = 18 5 + 13 = 18 6 + 12 = 18 13 + 79 = 92 8 + 32 = 40 51 + 83 = 134 84 + 80 = 164 20 + 85 = 105 43 + 74 = 117 18 × 1 = 18 59 - 41 = 18