20 加法 49 等于多少？
20 + 49 = 69
20加法49 等于 69
竖式演算
验算
- 用减法验算：69 − 49 = 20
- 用减法验算：69 − 20 = 49
相关题目
20 + 48 = 68
20 + 50 = 70
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20 + 51 = 71
20 + 46 = 66
20 + 52 = 72
20 + 53 = 73
20 + 45 = 65
19 + 49 = 68
21 + 49 = 70
22 + 49 = 71
18 + 49 = 67
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2 + 67 = 69
3 + 66 = 69
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14 + 54 = 68
41 + 32 = 73
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