81 加法 31 等于多少？

81 + 30 = 111 81 + 32 = 113 81 + 29 = 110 81 + 33 = 114 81 + 28 = 109 81 + 34 = 115 81 + 35 = 116 81 + 27 = 108 80 + 31 = 111 82 + 31 = 113 83 + 31 = 114 79 + 31 = 110 84 + 31 = 115 78 + 31 = 109 85 + 31 = 116 77 + 31 = 108 12 + 100 = 112 13 + 99 = 112 14 + 98 = 112 15 + 97 = 112 16 + 96 = 112 17 + 95 = 112 72 + 90 = 162 33 + 95 = 128 28 + 15 = 43 50 + 55 = 105 38 + 56 = 94 75 + 80 = 155 56 × 2 = 112 28 × 4 = 112