22 加法 9 等于多少？
22 + 9 = 31
22加法9 等于 31
竖式演算
验算
- 用减法验算：31 − 9 = 22
- 用减法验算：31 − 22 = 9
相关题目
22 + 8 = 30
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22 + 12 = 34
22 + 6 = 28
22 + 13 = 35
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21 + 9 = 30
23 + 9 = 32
20 + 9 = 29
24 + 9 = 33
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2 + 29 = 31
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