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数学速算万能法
更新时间: 2021-04-14 13:40:04  

1、被乘数的“数首”和乘数的“数尾'、被乘数的”数尾“和乘数的”数首“相乘以后,两积相加得一数;

2、被乘数的“数首“和乘数的”数首“、被乘数的”数尾“和乘数的”数尾“相乘以后,两积相加得一数;

3、把以上得到的那两个数相加起来便是全积。

关键词: 数学 万能

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