第七十七章:竖式——宗周——成周(2 / 2)

六朝汉臣 土豆刘 0 字 2021-04-16

一分钟</p>

两分钟</p>

…</p>

五分钟</p>

终于,他勉强总算理解了上面的内容——十三与十七的相关运算。</p>

由于竖式书写格式是从左往右,从上往下,这让习惯从右往左的人,阅读起来,格外吃力。</p>

孔安国喘着粗气,噘着嘴,急得满头大汗。</p>

“司公,安国愚钝,这要如何观看?为何‘3’、‘7’对着的下方,变成了‘0’?”</p>

司匡笑眯眯的,耐心解释,“因为满十需要向上一位进一,君可理解成诸侯向周天子进贡。”</p>

进贡……</p>

孔安国立刻把这种“进贡”思想与“周王诸侯”联系起来。</p>

忽然。</p>

一个奇怪的念头从深邃的脑海中划过。</p>

他不加思考,下意识便脱口而出。</p>

“如果诸侯不想进贡……甚至还想反咬一口,掠夺周王室京畿之地呢。”</p>

司匡:“……”</p>

这孩子怎么反向理解。</p>

是打算举一反三,还是纯粹想当杠精……</p>

反咬一口的行为,你得问减法,加法不接受。</p>

不过鉴于的二十一世纪某些孩子在第一次学习的时候,也存在这种想法。</p>

他就一下子释然了。</p>

继续耐心解释。</p>

“孔兄可以把这种加法的进位,看成宗周与诸侯的关系。”</p>

“同理!”</p>

司匡指着乘法,“此处,三七二十一所得之二十,也需要化成‘二’向前方大宗‘进贡’。”</p>

“至于那种侵占京畿之地的行为,那是成周所为,属于减法,吾在此先不解释。若兄长感兴趣,可以改日光临寒舍,小弟必定毫无保留地传授。”</p>

司匡害怕拿出减法之后,孔安国又开始追问“如果前面不借该怎么办”这种致命话题。</p>

二十一世纪被这个问题逼疯的家长,可不在少数!</p>

“好吧。”</p>

孔安国失落的撅了噘嘴。</p>

用袖子擦了擦额头上的汗珠,静下心来,试图按照宗周的情况,理解乘法竖式。</p>

灿若星辰的双眸,在乘法竖式上上下移动。</p>

经过提点,他理解起来,快了许多。</p>

正如司匡所言,这种方法,比《算表》简单多了!</p>

不需要查找,只要学会九九乘法表,即可运算。</p>

眼珠子转动。</p>

片刻功夫,他便以口算的形式,完成了13×17的竖式检验。</p>

激烈跳动的心脏,一下子悬了起来。</p>

他看向墙壁的目光,变得虚幻起来。</p>

肾上腺激素分泌加快。</p>

大脑有一种莫名的兴奋感。</p>

是触摸数术大道的兴奋,是学会新方法的激动。</p>

他大步迈出,凑上前,刚毅的面庞充斥着血液,腮帮子变成了深红色。</p>

颤抖的语气,随着颤抖的声带,发了出来。</p>

“君是如何想到这种方法的?”</p>

“这就说来话长了……与其纠结这个,孔兄不如再算一下其他两个数字。”</p>

司匡微微一笑,利用转移话题的形式,把这个要命的询问避开了。</p>

右手木炭快速在墙壁上写下来两个数字。</p>

47×98。</p>

随后,伸出右掌,把掌心中的木炭递给孔安国。</p>

“请!”</p>

孔安国接过木炭。</p>

抬起依旧在颤抖的手臂,在墙壁上的区域书写。</p>

这一次,刺耳的“吱吱”声,由他亲自创造。</p>

木炭在石块上留下长长的线条。</p>

因为用力过狠,有的木屑竟已渗入墙壁。</p>

这位第一次作用竖式进行实战的儒家未来大儒,双眼冒着红光,嘴里还碎碎叨叨,不停地呢喃着。</p>

“此乃宗周!”</p>

“宗周,天下共主也!”</p>

“凡诸侯,皆需觐见。”</p>

“所得之数过十,需进贡。”</p>

不一会儿,他通过列竖式,得出了一个答案。</p>

47</p>

×98</p>

———</p>

4606</p>

他将结果写在司匡刚刚列出来的式子后。</p>

整个人如梦似幻,不由得痴了。</p>

一时间,有些分不清虚幻与真实。</p>

由于孔安国从来没有算过这两个数字,并不清楚结果的对与错,又因为出来的匆忙,没有携带《算表》,算完之后,他有些不知所措。</p>

心情既期待,又恐慌。</p>

手心出汗了。</p>

木炭被汗珠浸湿。</p>

随着紧张感的提升,捏在手心的木炭,一点一点的变碎。</p>

忽然,一阵清朗的声音从门口的方向传来,“二位来此作甚?”</p>

司匡与孔安国同时扭头,朝着声音来源望去。</p>

只见,一个穿着暗黑色汉服,束着发带,龙眉凤目,皓齿朱唇,留着短胡子,约摸二、三十岁的男人,正倚着门框,双手环胸,笑容灿烂,望着院子内的二人。</p>

“王贺,你来了!”</p>

孔安国笑逐颜开,像是看到救星似的,一路小跑,跑过去。</p>

没有解释,直接强硬拽着这位墨家年青一代第一人,往九九乘法表这里走。</p>

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