1 加法 11 等于多少？

1 + 10 = 11 1 + 12 = 13 1 + 13 = 14 1 + 9 = 10 1 + 14 = 15 1 + 8 = 9 1 + 15 = 16 1 + 7 = 8 2 + 11 = 13 3 + 11 = 14 4 + 11 = 15 5 + 11 = 16 6 + 11 = 17 7 + 11 = 18 8 + 11 = 19 9 + 11 = 20 2 + 10 = 12 3 + 9 = 12 4 + 8 = 12 5 + 7 = 12 6 + 6 = 12 7 + 5 = 12 12 + 44 = 56 31 + 44 = 75 24 + 63 = 87 100 + 98 = 198 74 + 3 = 77 27 + 1 = 28 75 - 63 = 12 43 - 31 = 12