19 加法 12 等于多少？
19 + 12 = 31
19加法12 等于 31
竖式演算
验算
- 用减法验算：31 − 12 = 19
- 用减法验算：31 − 19 = 12
相关题目
19 + 11 = 30
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19 + 15 = 34
19 + 9 = 28
19 + 16 = 35
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18 + 12 = 30
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17 + 12 = 29
22 + 12 = 34
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2 + 29 = 31
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