100 加法 21 等于多少？
100 + 21 = 121
100加法21 等于 121
竖式演算
验算
- 用减法验算：121 − 21 = 100
- 用减法验算：121 − 100 = 21
相关题目
100 + 20 = 120
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100 + 18 = 118
100 + 25 = 125
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98 + 21 = 119
97 + 21 = 118
96 + 21 = 117
95 + 21 = 116
94 + 21 = 115
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22 + 99 = 121
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