90 加法 30 等于多少？
90 + 30 = 120
90加法30 等于 120
竖式演算
验算
- 用减法验算：120 − 30 = 90
- 用减法验算：120 − 90 = 30
相关题目
90 + 29 = 119
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90 + 27 = 117
90 + 34 = 124
90 + 26 = 116
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91 + 30 = 121
92 + 30 = 122
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3 × 40 = 120
6 × 20 = 120