89 加法 31 等于多少？
89 + 31 = 120
89加法31 等于 120
竖式演算
验算
- 用减法验算：120 − 31 = 89
- 用减法验算：120 − 89 = 31
相关题目
89 + 30 = 119
89 + 32 = 121
89 + 29 = 118
89 + 33 = 122
89 + 28 = 117
89 + 34 = 123
89 + 35 = 124
89 + 27 = 116
88 + 31 = 119
90 + 31 = 121
87 + 31 = 118
91 + 31 = 122
92 + 31 = 123
86 + 31 = 117
93 + 31 = 124
85 + 31 = 116
20 + 100 = 120
21 + 99 = 120
22 + 98 = 120
23 + 97 = 120
24 + 96 = 120
25 + 95 = 120
56 + 88 = 144
78 + 79 = 157
77 + 66 = 143
88 + 99 = 187
29 + 83 = 112
78 + 84 = 162
10 × 12 = 120
40 × 3 = 120