21 加法 77 等于多少？
21 + 77 = 98
21加法77 等于 98
竖式演算
验算
- 用减法验算：98 − 77 = 21
- 用减法验算：98 − 21 = 77
相关题目
21 + 76 = 97
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21 + 74 = 95
21 + 80 = 101
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20 + 77 = 97
22 + 77 = 99
19 + 77 = 96
23 + 77 = 100
24 + 77 = 101
18 + 77 = 95
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2 + 96 = 98
3 + 95 = 98
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60 + 28 = 88
2 + 17 = 19
41 + 4 = 45
10 + 42 = 52
15 + 40 = 55
50 + 40 = 90
49 × 2 = 98
98 × 1 = 98