20 加法 71 等于多少？
20 + 71 = 91
20加法71 等于 91
竖式演算
验算
- 用减法验算：91 − 71 = 20
- 用减法验算：91 − 20 = 71
相关题目
20 + 70 = 90
20 + 72 = 92
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20 + 73 = 93
20 + 74 = 94
20 + 68 = 88
20 + 75 = 95
20 + 67 = 87
19 + 71 = 90
21 + 71 = 92
22 + 71 = 93
18 + 71 = 89
23 + 71 = 94
17 + 71 = 88
24 + 71 = 95
16 + 71 = 87
1 + 90 = 91
2 + 89 = 91
3 + 88 = 91
4 + 87 = 91
5 + 86 = 91
6 + 85 = 91
51 + 48 = 99
16 + 23 = 39
16 + 21 = 37
50 + 16 = 66
42 + 56 = 98
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96 - 5 = 91