31 乘法 7 等于多少?
31 × 7 = 217
31乘法7 等于 217
竖式演算
验算
- 用除法验算:217 ÷ 7 = 31
- 用除法验算:217 ÷ 31 = 7
相关题目
31 × 6 = 186
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31 × 10 = 310
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