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王海鹏

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第一次课

2013-09-15 12:56:42| 分类：成长篇 | 标签： |举报 |字号大中小订阅

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怀着一份懵懂的心情走进提高班,一直不敢相信那些奇迹的我在两天的学习中终于见识到传说中的奇迹原来真的存在.

暑假的时候只顾得打工,没有完成老师的任务,无论是打字,还是视频都没有看,现在发现自己已经和同学们有了好大的差距,也不知道在以后的生活中还可不可以赶得上同学们,不过在以后的学习中我一定要奋起直追.

今天老师讲的数学简便算法:

15*15=225

17*13=221

规律:个位数相加为十,十位数相同

后两位为个位相乘,十位乘以十位加一

证明:a代表十位上的数字,b代表个位上的数字

(a*10+b)*[a*10+(10-b)]=(a*10)^2+a*10(10-b)+a*10*b+b*(10-b)

=(a^2+a)*100+b*(10-b)

=a*(a+1)*100+b*(10-b)

深知数学的奥秘博大精深，100以内的乘法相信还有很多简便算法，一定要好好研究，未完，待续......

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