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
81 + 89 = 170
76 + 67 = 143
47 + 57 = 104
99 + 23 = 122
63 + 48 = 111
21 + 79 = 100
30 × 4 = 120
2 × 60 = 120