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第361章 世子戏言算法现,皇父灶房闻怨言(1 / 2)

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永嘉侯世子指尖的金箔莲花在日影里转出半圈光晕,忽而屈指弹向徐三郎案头。

那纤薄金片贴着《九章算术》的书脊滑落,恰在坠入炭盆的刹那被少年勋贵用错金匕首挑起,刀锋映着徐三郎冻得发紫的嘴唇:"听闻三郎擅测圆之术,不若替本世子算算——"

"要测美人腰围几何,该用割圆线还是方田术?"

哄笑声撞碎了廊下冰凌。

几个纨绔子弟故意将砚台敲得咚咚响,朱红洒金的袖口扫得满案算筹乱飞。

徐三郎蜷着生满冻疮的手指,沾血的《测圆海镜》残页在风中簌簌作响,倒像是应和着檐角铁马的叮当。

"学生...学生愿试。"寒门少年突然起身,旧棉袍擦过青石案时带起细雪般的墨灰。

他盯着永嘉侯世子匕首尖上晃动的金箔,瞳孔里映出莲花瓣上蜿蜒的血痕:"需知女子腰围当以髀骨为径,取周三径一之法..."

"荒唐!"

朱标的呵斥声惊飞了梁间蜘蛛。

蟒纹玉带撞在青铜日晷上发出清越鸣响,太子不知何时已踏上三尺讲台,炭笔在灰墙上划出凌厉的弧线:"《周髀算经》有云:环矩以为圆,合矩以为方。

尔等可知方中有圆,圆中藏方?"

满室死寂中,徐三郎算草纸上的墨迹突然洇开奇异纹路。

朱标腕间螭纹钏渗出的血珠顺着炭笔滚落,在墙面勾出个浑圆如月的几何图形。

永嘉侯世子眯眼望去,见那血色圆环竟与金箔莲花形状暗合,刀尖不自觉地挑破了书页间夹着的胭脂笺。

"取勾股弦三法互证。"太子运笔如飞,炭灰混着血水在墙面铺展成星图,"若以日晷投影为弦,廊柱间距为股,此刻日影偏移三寸七分——"他忽然转身劈手夺过老学究怀中的《洪武丈量图册》,书页翻动声惊醒了趴在窗棂上的朱元璋。

太上皇的乌皮靴碾过灶房门槛,指尖还沾着揉面留下的荞麦粉。

他透过雕花槅扇望见灰墙上逐渐成型的割圆术图解,忽然想起三十年前鄱阳湖血战中,刘伯温在桅杆上画的星象推演图。

"...故可知美人腰围当取方圆之变数。"朱标的炭笔停在《孟子》"恻隐之心"处,血痕恰好漫过"心"字最后一捺,"《九章》方田篇记绳测之法,《海岛算经》载重表之术,然真要测度人心..."太子猛地将图册拍在永嘉侯世子案头,震得那柄错金匕首坠入算筹堆里。

徐三郎突然剧烈咳嗽,指缝渗出的血珠滴在太子方才演算的"圆容方"图形上。

寒门学子们不约而同地往前倾身,七八件打着补丁的棉袍拂过地面香灰,竟在青砖上擦出类似割圆仪的规整痕迹。

"标儿这算法..."朱元璋捏碎掌心的冻柿子,甜腻汁水顺着指缝渗进灶台裂缝。

他望着灰墙上渐渐干涸的血色公式,恍惚看见当年马皇后教幼子打算盘时,朱标用小木棍在沙地上画的那些奇异符号。

永嘉侯世子突然抚掌大笑,金箔莲花不知何时已变成环矩形状。

少年勋贵染着凤仙花汁的指甲轻扣环心,清越颤音中夹杂着算珠落盘的噼啪声:"太子殿下用割圆术解风月题,当真妙极!

只是这血染的圆周率..."

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