99 加法 21 等于多少？
99 + 21 = 120
99加法21 等于 120
竖式演算
验算
- 用减法验算：120 − 21 = 99
- 用减法验算：120 − 99 = 21
相关题目
99 + 20 = 119
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99 + 24 = 123
99 + 18 = 117
99 + 25 = 124
99 + 17 = 116
98 + 21 = 119
100 + 21 = 121
97 + 21 = 118
96 + 21 = 117
95 + 21 = 116
94 + 21 = 115
93 + 21 = 114
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21 + 99 = 120
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