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
78 + 47 = 125
73 + 89 = 162
48 + 68 = 116
96 + 34 = 130
9 + 98 = 107
49 + 51 = 100
60 × 2 = 120
40 × 3 = 120