90 加法 31 等于多少？
90 + 31 = 121
90加法31 等于 121
竖式演算
验算
- 用减法验算：121 − 31 = 90
- 用减法验算：121 − 90 = 31
相关题目
90 + 30 = 120
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90 + 34 = 124
90 + 35 = 125
90 + 27 = 117
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91 + 31 = 122
92 + 31 = 123
88 + 31 = 119
93 + 31 = 124
87 + 31 = 118
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22 + 99 = 121
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26 + 95 = 121
83 + 94 = 177
74 + 45 = 119
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78 + 30 = 108