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计算123456789×27，好方法只需15秒，直接写答案
3:35
bilibili大鱼课堂
计算123456789×27，好方法只需15秒，直接写答案
首先27我们可以写成9×3，123456789这个数是有规律的，它等于9个1+8个1+7个1一直到加上1，我们再把9乘进去后凑整即可解题。
13.9K viewsSep 22, 2019
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