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第48章 大宗师(1 / 2)

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“怎么了?”

身后传来李世民的声音,李牧强压怒火,转头赔笑道:“陛下,臣家里的笔质量太不好了,没关系,不耽误。”

李牧转回脸,脸上的笑容迅速敛去,压低嗓子道:“你俩要是再问个没完,这辈子休息知道解法,现在我来说,你俩听,听不懂自己去想,不要再问我了!”

见李牧盛怒,李淳风和李泰都不敢再问了。没办法,谁让现在全天下就他一个人知道这题的解法呢?真惹急了,就不教,谁还能有什么办法?就算皇帝聘请老师,也得老师同意不是?

“这个问题中,有三个未知数,分别是公鸡,母鸡,和小鸡。三者合一,共一百只。现在我假设公鸡有a只,母鸡有b只,那么可以得到小鸡的数目。”

李牧写下a、b和100-a-b,道:“你们看过大唐日报了,这样写,能看懂吧?”

“兄长……”

李泰要提问,但是李牧根本不给他提问的机会,继续讲道:“又知,公鸡价值五,母鸡价值三,三只小鸡价值一,共计一百。那么我们可以得出这个等式。”

李泰真的很想问一下,啥叫未知数,啥是等式,但看到李牧这态度,话到了嘴边也不敢说,悄悄看向李淳风,见他好像听懂了似的,不仅心中暗叹,不愧是淳风师父啊,竟然能听懂。

其实李淳风也是一知半解,但他确是要比李泰明白得多一点,至少他能理解等式是什么意思。他在来之前,仔细研究过李牧设计的符号,知道等式大概应该就是两边的数值相等的意思。

“5Xa+3Xb+(100-a-b)X1/3=100”

看到这儿,李淳风终于忍不住了,道:“侯爷恕罪,请问这条斜线是何用意,四则运算符号中并没有这一个啊。”

李牧忍耐火气,道:“三只小鸡价值一,那么一只小鸡价值几何?自然是一除三这么多了,但是一能除开三么?不能,因为一比三小。那么该如何表示这个小于一的数呢,于是我发明了‘分数’的概念,分数者,分数也。上面的是被分的数,下面是份数,理解了么?”

李淳风恍然大悟,赶紧道:“理解了,理解了。”

李牧正要继续往下说,忽然迟疑了一下。一次性把当代的数学水平提升太高,真的合适么?

人类的一切学科的发展,起因都是人类的需求。数学也是这样,古代的数学发展迟缓,主要原因,并非是人类的进化度,而是人类的需求度。古代人少,资源也少,需要的计算也少。因此并不需要太精神的数学,人们也想象不到数学的抽象部分。

但这能说明古人就笨么?当然不是,只是古人把才华用到了别的地方而已。若自己强行把数学拔高一个层次,李牧不觉得会有多少作用,而且,还会引人注目,被当做妖孽一样。

不行,还是得控制一下。

心里打定了主意,李牧便没有列出第二个方程,而是采用了穷举法。

李牧指着等式说道:“咱们看来这个等式,5Xa表示公鸡花费的钱,3Xb表示母鸡花费的钱,而小鸡花费的钱,我们由(100-a-b)X1/3可以得出。同时,我们还能根据题目和这个等式,得出三个信息。”

“第一个,小鸡的数目,可以被三整除。”

“第二个,a和b还有小鸡的数目,都是一个比零大的数。”

“第三个,a和b还有小鸡的数目,都是一个整数。”

李泰萌萌地问道:“兄长,啥叫整数?”

“整数就是一、二、三这样的数,完整的数!”

“那又为啥不能是分数?就像刚刚你说的小鸡的钱数那样的……”

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