20 加法 81 等于多少？
20 + 81 = 101
20加法81 等于 101
竖式演算
验算
- 用减法验算：101 − 81 = 20
- 用减法验算：101 − 20 = 81
相关题目
20 + 80 = 100
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20 + 78 = 98
20 + 85 = 105
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19 + 81 = 100
21 + 81 = 102
22 + 81 = 103
18 + 81 = 99
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2 + 99 = 101
3 + 98 = 101
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19 + 64 = 83
12 + 8 = 20
29 + 22 = 51
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16 + 83 = 99