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45*45有什么规律

更新时间: 2020-10-31 00:00:00     

45*45等等这些相同的带5的两位数相乘,结果结尾都是25,关键是求前面几位数我们除去5(不看5),4乘4再加本身为20,所以45*45结果为2025;再来,看25*25,我们看2乘2再加本身2为6,所以结果为625;再来看35*35,我们看3乘以3再加3为12所以结果为1225;再来看65*65,因为6*6+6=42所以结果为4225,以此类推

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