第14章、二元一次方程
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老板娘白了巫掌柜一眼:“还不快给老娘数去,看看有没算错了。要错了,看老娘怎么削你!”
巫掌柜连忙转身去检查笼子。
就在这时,杨奇在里面说到:“鸡鸭一共二十六只,兔子十五只。如果小憨子没有数错笼中鸡鸭兔的数,那今日的商贩,没有骗人。”
本来正在沉迷书中的老周管家抬头看向了杨奇。
一旁,也在案几上沾了酒勾划的邋遢道人低头算着,过了好一会,他才抬起头来看着杨奇,眼里充满了不可思议。
他的案几上,还未干的痕迹里,显示着他龙飞凤舞的字迹:“假使雉都抬起一只脚,则”
邋遢道人抬起头,看着杨奇:“小郎君,你之前看过《孙子算经》?”
老周管家也用着急切的眼神看着杨奇。
杨奇轻摇了摇头,他的确没有撒谎,自己是没有看过,只是小学时学过奥数,同时知道有那么一而已。
邋遢道人点点头:“也是,就算看过,也不会算这么快。”
他想了想,拱手道:“小郎君,不知道可否让我看一看你的解算方法?”
不就是一道小学三四年级的二元一次方程嘛。
杨奇往旁边侧让开:“先生请。”
邋遢道人几个大步就跨了过来,低头看向案几上。
老周管家也第一时间凑了过来。
杨奇在一旁指着“x”和“y”解释:“先生可以把这上面的两个符号,看做是代指,就是未知数,代指‘甲’和‘乙’就可以。”
邋遢道人和老周管家一起看了一会,嘴里都发出啧啧的赞叹。
这时,外面好不容易才数清楚笼里鸡鸭兔数目的巫掌柜,开心地对着老板娘说:“娘子,你看,小憨子今日没有数错。”
“瞧你乐的,小眼睛都要眯没了。”见没有算错,老板娘的态度也缓和了不少,转身说到:“你瞧瞧里面的公子,人家可是早就算出来了。”
说着,她朝着杨奇招招手:“这位公子,今日您的菜金打七折。”
旁边的酒客们起哄着:“柜娘,那我们的呢!?”
老板娘一扭圆腰:“你们要也能像那位公子那样算得又快又准,老娘也给你们打折!”
酒客:“哟,柜娘,那巫掌柜晚上在炕上是不是也又快又准啊!”
满堂大笑。
老板娘一拍柜台,笑骂到:“不然你当我家那几小只哪里来的啊!”
酒客们再次大笑起来。
巫掌柜也笑着抱拳向着酒客们求饶。
酒楼里充满了欢乐的气息。
邋遢道人问到:“小郎君,这解算方法可有称呼?”
“二元一次方程。”杨奇反问:“先生可曾看过《九章算术》?我听说里面就有方程式的解法。”
邋遢道人遗憾地摇了摇头:“我曾听闻在山东有此书出现,也曾特意寻去,奈何无缘得见。”
杨奇心里暗暗惊讶:“这些书,不都是古代的科普材料吗?怎么一个个都没见过。”
邋遢道士暗想:“想来这小郎君出身必然不俗,否则又如何识得这解算方法。”
不过他为人豁达,想到彼此约定只结交不论出身,倒也没有追问。
一旁的老周管家看了看杨奇,又看了看邋遢道人。
他想了想,咬咬牙,把手中的《孙子算经》合了起来,轻放在案几上,递过去给邋遢道人。
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