19 加法 9 等于多少？
19 + 9 = 28
19加法9 等于 28
竖式演算
验算
- 用减法验算：28 − 9 = 19
- 用减法验算：28 − 19 = 9
相关题目
19 + 8 = 27
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19 + 7 = 26
19 + 12 = 31
19 + 6 = 25
19 + 13 = 32
19 + 5 = 24
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18 + 9 = 27
21 + 9 = 30
17 + 9 = 26
22 + 9 = 31
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2 + 26 = 28
3 + 25 = 28
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30 - 2 = 28