21 加法 68 等于多少？
21 + 68 = 89
21加法68 等于 89
竖式演算
验算
- 用减法验算：89 − 68 = 21
- 用减法验算：89 − 21 = 68
相关题目
21 + 67 = 88
21 + 69 = 90
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21 + 65 = 86
21 + 71 = 92
21 + 64 = 85
21 + 72 = 93
20 + 68 = 88
22 + 68 = 90
19 + 68 = 87
23 + 68 = 91
24 + 68 = 92
18 + 68 = 86
25 + 68 = 93
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1 + 88 = 89
2 + 87 = 89
3 + 86 = 89
4 + 85 = 89
5 + 84 = 89
6 + 83 = 89
51 + 12 = 63
68 + 1 = 69
41 + 6 = 47
33 + 45 = 78
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97 - 8 = 89
98 - 9 = 89