12 加法 5 等于多少？
12 + 5 = 17
12加法5 等于 17
竖式演算
验算
- 用减法验算：17 − 5 = 12
- 用减法验算：17 − 12 = 5
相关题目
12 + 4 = 16
12 + 6 = 18
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12 + 2 = 14
12 + 8 = 20
12 + 1 = 13
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13 + 5 = 18
10 + 5 = 15
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2 + 15 = 17
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1 × 17 = 17