8 加法 5 等于多少？

8 + 4 = 12 8 + 6 = 14 8 + 3 = 11 8 + 7 = 15 8 + 2 = 10 8 + 8 = 16 8 + 1 = 9 8 + 9 = 17 7 + 5 = 12 9 + 5 = 14 6 + 5 = 11 10 + 5 = 15 11 + 5 = 16 5 + 5 = 10 12 + 5 = 17 4 + 5 = 9 1 + 12 = 13 2 + 11 = 13 3 + 10 = 13 4 + 9 = 13 5 + 8 = 13 6 + 7 = 13 45 + 61 = 106 75 + 42 = 117 79 + 3 = 82 95 + 64 = 159 82 + 62 = 144 87 + 40 = 127 44 - 31 = 13 97 - 84 = 13