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第39章 出来吧!四则运算!(2 / 2)

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小主,这个章节后面还有哦,请点击下一页继续阅读,后面更精彩!李牧已经很努力说得简单易懂了,但他早就忘了当年学习加减乘除的时候老院长是怎么教的了。现在他早就练就了心算的本能,这些步骤在他计算的时候,几乎都忽略不计了,实在是没办法再说得更简单了。

啼哩吐噜说了一大堆,李牧把自己说得有点糊涂了,看了眼蹲在旁边一直皱眉沉思状的王鸥,心里非常没底她能不能听懂。

王鸥半天没说话,忽然捡起树枝,在地上写了一个12X13,然后按照李牧教的乘法,一步步计算得出了156。又按照李牧教的除法,用156除以12,得出了13。”李牧激动得直拍手,一把抓住王鸥的胳膊,激动道:“你真是太聪明了!我说得这么乱你都听明白了!真是厉害!”

王鸥被李牧抓住胳膊,下意识便想往回缩,但看到李牧兴奋的样子,眼睛里闪过一丝犹豫,没有这样做。她还是头一次被一个男人主动抓着胳膊,心中涌起几分异样的感觉,不过她已经不是懵懂无知的少女了,没有了过分的羞涩,只是脸颊微微泛红而已。

她用12乘13,是因为她昨天刚运来十二车的布匹,每辆车上十三匹布,一百五十六这个结果,其实是一匹一匹报数查出来的。有了这个准确的答案,再来验证李牧的算法,自然可以知道准确与否。

结果令她吃惊不已,李牧的算法竟然如此准确,分毫不差。眼前这个十七岁的男子,竟然真的自己发明了一种算法。而且还如此简便,几乎不用懂得什么算理就可以使用,他到底是怎么做到的,如此大的本事!

若真有人天才至此,那当世研究算经之人,皓首穷经岂不成了笑话么?

王鸥不是容易动气之人,但此时也不禁想为自己年幼时学了那么多年的算经讨个说法。她寻思了一下,忽然想起当年看过的一本北魏时期的《邱建算经》中的一道无解之题,此题名为‘百鸡问’。自北魏年间成书以来,迄今三百余年,无人可解这个问题。

王鸥也不指望李牧能解得了,她就是想打击李牧一下,看看他受挫的样子。她也不知为何自己忽然有了这种恶趣味,她清楚地知道,自己不是这样的人。许是见到李牧的种种惊奇之后,心里就乱了章法吧。

打定主意,王鸥便把这‘百鸡问’说了出来。

“侯爷,奴家也看过算经,有一道题至今奴家也没有解出答案,不知你这算法能否解答?”

李牧不知王鸥打得什么主意,以为她还是不服气自己的四则运算,便道:“你说,我试试。”

“有公鸡,值钱五;母鸡一,值钱三,鸡仔三,值钱一。以百钱买鸡百只,问公鸡、母鸡、鸡仔各几何?”

“唔……这个问题么?”李牧沉吟了一下,倒是没有感觉到难度,他只是觉得奇怪,唐朝时候的数学水平,就已经开始研究三元不定方程组了么?

王鸥见李牧为难,心中欣喜,终于难住他了!

“若是太难了,侯爷便不要算了,奴家只是好奇而已,这道题古今……”王鸥本想说,这道题古今多少算学大师都没有算出来,算不出来也不丢人,话音未落,只听李牧道:“公鸡四只,母鸡十八只,鸡仔七十八只,或者公鸡八只,母鸡十一只,鸡仔八十一只。又或者公鸡十二只,母鸡四只,鸡仔八十四只!一共三个答案!”

“啊?”王鸥完全愣住了,李牧不仅说出了答案,而且还一说就是三个答案。

李牧见她发愣,心中得意,道:“若不信,可以验证一下。”

王鸥当然要验证,正好李牧刚刚教了她乘法,验证倒也用不了多少时间。她只验证了第一个答案,算出来确实是正确的。忽然有些自闭了起来,看着地上的数字,好半天没有出声。

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