81 加法 88 等于多少？

81 + 87 = 168 81 + 89 = 170 81 + 86 = 167 81 + 90 = 171 81 + 85 = 166 81 + 91 = 172 81 + 92 = 173 81 + 84 = 165 80 + 88 = 168 82 + 88 = 170 83 + 88 = 171 79 + 88 = 167 84 + 88 = 172 78 + 88 = 166 85 + 88 = 173 77 + 88 = 165 69 + 100 = 169 70 + 99 = 169 71 + 98 = 169 72 + 97 = 169 73 + 96 = 169 74 + 95 = 169 93 + 20 = 113 9 + 78 = 87 99 + 80 = 179 51 + 64 = 115 97 + 80 = 177 61 + 98 = 159 13 × 13 = 169 16 + 34 = 50