30 加法 9 等于多少？
30 + 9 = 39
30加法9 等于 39
竖式演算
验算
- 用减法验算：39 − 9 = 30
- 用减法验算：39 − 30 = 9
相关题目
30 + 8 = 38
30 + 10 = 40
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30 + 7 = 37
30 + 12 = 42
30 + 6 = 36
30 + 13 = 43
30 + 5 = 35
29 + 9 = 38
31 + 9 = 40
28 + 9 = 37
32 + 9 = 41
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2 + 37 = 39
3 + 36 = 39
4 + 35 = 39
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6 + 33 = 39
94 + 2 = 96
63 + 36 = 99
47 + 10 = 57
21 + 45 = 66
34 + 20 = 54
31 + 43 = 74
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99 - 60 = 39