第146章 天门郡第一美女。
笔趣阁(biquge321.com)更新快,无弹窗!
去你的!”
文阿秀一笑,捂着嘴跑了。
早饭后,门卫带着上官季夫来了。
叶坤刚刚招待上官季夫落座,门卫又报:“上官大人,叶大人,何田田姑娘,带着她父亲来了,要拜见叶大人。”
叶坤点点头:“请进来。”
上官季夫皱眉:“何田田是谁?”
“就是你给我买的一个小丫头,我刚才放了她。”叶坤翻白眼:
“四哥,我看天门郡民有菜色,你粮仓里积粮如山,也拿点出来给老百姓吧。收揽人心,才能让更多的黔首百姓跟着我们干大事。”
天门郡本来粮食库存就多,上次打长沙,又分了许多粮食和肉脯,不缺吃的。
苦的是那些老百姓,已经开始卖儿卖女了。
上官季夫倒也给面子,点点头,吩咐自己的亲兵:
“传我的命令,每天五百斤米,五十斤肉脯,在四门之内,施咸肉粥赈灾。”
亲兵领命去办。
叶坤竖起大拇指:“四哥广施仁义,民心所归,今后必定一呼百应。”
上官季夫嘻嘻一笑:“少来这一套,我是来看你的新式兵器。听说,你搞出来的炸弹很厉害。”
叶坤翻白眼:“急什么?会让你看到的。”
说话间,何田田带着父亲来了,在阶下磕头。
叶坤起身,亲自去阶下扶起何田田的父亲:
“老何,不用多礼,听说你会算账,我有个问题请教你。”
老何大约四十岁,清瘦无神,诚惶诚恐,深深作揖:“不敢当请教二字,叶大人有何吩咐,请说。”
叶坤想了想,问道:“今有鸡兔同笼,上有三十五头,下有九十四足。问鸡兔各有几何?”
上官季夫听着,不由得噗嗤一笑:
“这都什么问题啊,谁这么无聊,为什么要把兔子和鸡,关在一个笼子里?”
叶坤回头:“你别捣乱。”
对面,老何微微思索,眼神里亮光一闪:“鸡二十三,兔十二。”
“恭喜你,回答正确。”
叶坤有些小惊喜,请老何坐下,笑道:“怎么算出来的,能说说吗?”
这个简单的鸡兔同笼问题,叶坤考过王县丞和黄思忠,还有文阿秀,他们只能用穷举法,一个个试验,才能得出答案。
老何能够一口说出答案,可见不简单。
老何讪讪一笑,比画道:
“比方,把所有鸡兔,都砍去两腿。三十五头,就一共砍下七十条腿。剩下二十四条腿,都是兔子的,每个兔子还剩有两条腿,可知兔子有十二只,反推可知,鸡有二十三只……”
啪啪啪!
叶坤鼓掌大笑:“厉害啊,老何。我还有个问题,能不能再请教一下?”
老何点点头:“请叶大人出题。”
叶坤要来笔墨和尺规,画了一个圆,还有直径,问道:“圆长比径长,其比几何?之后,能不能再精确一些?”
这就是个圆周率问题,大鼎国数学家,已经算到了,工匠们大多知道这个数字。
叶坤想试试,老何能不能把圆周率再推进一些。
老何看了看图,皱眉道:
“圆径比,我以前也算过。以圆径为一丈例,圆周盈数三丈一尺四寸一分,到二分之间。”
叶坤惊愕。
这已经很厉害了,埋没在民间的数学家啊!
老何看着叶坤,小心翼翼地问道:“叶大人,我算错了吗?”
“没错。”叶坤点点头,在木板上写下一行字:
“圆径比,还可以再精确一点,以直径一丈为例,其周长应该是三丈一尺四寸一分五厘九毫二秒七忽。后面还有,算不完的,但是27,够用了。”
老何大吃一惊,拱手道:“原来叶大人是数算大家,草民真是大开眼界。”
“数算之道,无穷无尽,我只是略知皮毛。”
叶坤谦虚一笑,又以直径一丈为例,问老何能不能算出面积。
老何以前显然算过,一口报出答案。
叶坤一笑,又问:“直径一丈的圆球,面积是多少,能不能算出来?”
老何懵逼了,抱拳认输:“叶大人,圆球面积,我算不出来。”
叶坤点点头:“等我不忙了,教你怎么算圆球面积。”
上官季夫早就不耐烦了,苦笑道:“叶大人,你们算这个有用吗?打仗能用上吗?”
老何低着头,不敢说话。
“怎么用不上?天下万物,都在数算之中。”
叶坤翻白眼,问道:“假设我们打仗,遇见对方军队从远处走来,怎么知道大约距离?”
上官季夫想都不想:“凭眼睛看呀,要不怎么知道?”
“你就知道凭眼看。”叶坤摇摇头:
“有一种测量方法,叫做拇指测距法,就是根据数算知识来的。这
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