2 加法 20 等于多少？

2 + 19 = 21 2 + 21 = 23 2 + 22 = 24 2 + 18 = 20 2 + 23 = 25 2 + 17 = 19 2 + 24 = 26 2 + 16 = 18 1 + 20 = 21 3 + 20 = 23 4 + 20 = 24 5 + 20 = 25 6 + 20 = 26 7 + 20 = 27 8 + 20 = 28 9 + 20 = 29 1 + 21 = 22 3 + 19 = 22 4 + 18 = 22 5 + 17 = 22 6 + 16 = 22 7 + 15 = 22 80 + 9 = 89 100 + 31 = 131 17 + 21 = 38 61 + 100 = 161 14 + 71 = 85 21 + 6 = 27 27 - 5 = 22 89 - 67 = 22