21 加法 51 等于多少？
21 + 51 = 72
21加法51 等于 72
竖式演算
验算
- 用减法验算：72 − 51 = 21
- 用减法验算：72 − 21 = 51
相关题目
21 + 50 = 71
21 + 52 = 73
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21 + 53 = 74
21 + 48 = 69
21 + 54 = 75
21 + 47 = 68
21 + 55 = 76
20 + 51 = 71
22 + 51 = 73
19 + 51 = 70
23 + 51 = 74
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25 + 51 = 76
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2 + 70 = 72
3 + 69 = 72
4 + 68 = 72
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78 + 100 = 178
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18 × 4 = 72