31 加法 89 等于多少？
31 + 89 = 120
31加法89 等于 120
竖式演算
验算
- 用减法验算：120 − 89 = 31
- 用减法验算：120 − 31 = 89
相关题目
31 + 88 = 119
31 + 90 = 121
31 + 87 = 118
31 + 91 = 122
31 + 92 = 123
31 + 86 = 117
31 + 93 = 124
31 + 85 = 116
30 + 89 = 119
32 + 89 = 121
29 + 89 = 118
33 + 89 = 122
28 + 89 = 117
34 + 89 = 123
35 + 89 = 124
27 + 89 = 116
20 + 100 = 120
21 + 99 = 120
22 + 98 = 120
23 + 97 = 120
24 + 96 = 120
25 + 95 = 120
42 + 99 = 141
68 + 44 = 112
51 + 89 = 140
56 + 68 = 124
36 + 74 = 110
89 + 81 = 170
60 × 2 = 120
5 × 24 = 120