21 加法 10 等于多少？
21 + 10 = 31
21加法10 等于 31
竖式演算
验算
- 用减法验算：31 − 10 = 21
- 用减法验算：31 − 21 = 10
相关题目
21 + 11 = 32
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21 + 8 = 29
21 + 13 = 34
21 + 7 = 28
21 + 14 = 35
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22 + 10 = 32
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2 + 29 = 31
3 + 28 = 31
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6 + 25 = 31
14 + 52 = 66
6 + 53 = 59
52 + 26 = 78
61 + 22 = 83
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93 - 62 = 31