28 加法 3 等于多少？
28 + 3 = 31
28加法3 等于 31
竖式演算
验算
- 用减法验算：31 − 3 = 28
- 用减法验算：31 − 28 = 3
相关题目
28 + 2 = 30
28 + 4 = 32
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28 + 5 = 33
28 + 6 = 34
28 + 7 = 35
28 + 8 = 36
28 + 9 = 37
29 + 3 = 32
27 + 3 = 30
30 + 3 = 33
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2 + 29 = 31
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90 - 59 = 31