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第30章 牛爵爷的顿(1 / 2)

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过得片刻,李莫愁笑道:“云儿已算到第四位,郭夫人才到分位呢!”

黄蓉大惊,心想:“这贼子怎这般快?”

额头不禁沁出汗珠,试三商时算珠竟散乱开来,她忙定了定心神,心里默算着:“三百四十六乘三……积一千零三十八?”

却不想朱漆筹突然也散乱了——

余数处理失了秩序。

易逐云却依旧神色从容,已然算到了“x? = 1. ”,而此时那铜壶仅仅滴了六十七次。

毕竟他是借助“牛爵爷”的方法,这一番比试,如同降维打击一般。

黄蓉历经无数大小之事,但她生性骄傲,极少受挫,又觉此次对手是劲敌中的劲敌,心中怎能不紧张?

她的玉手都微微发起抖来。

正摆放算筹时,又听李莫愁笑道:“半刻还没到,云儿已算至六位啦!”

语气中满是得意。

黄蓉停下手中动作,站起身来,看向易逐云的结果,说道:“你这是何种算术?”

众人也都纷纷将目光投向易逐云。

易逐云这才停下运算,心念一转,笑道:“此乃‘流数术’。”

黄蓉笑道:“是谁教你的?别跟我说竟是莫愁妹子!”

说着走上前,拿起易逐云的算数草纸,只见上面依旧如鬼画符一般,看得她一头雾水。

李莫愁笑道:“谁说不是我教的?”

黄蓉将草纸递给李莫愁,说道:“那妹子给姐姐解释解释,这上面写的都是些什么?”

李莫愁脸颊一红,可这又该如何向她讲解?毕竟她自己也瞧不明白。

易逐云从黄蓉手中接过草纸,笑道:“我元真教信奉真武帝君,我这流数术乃是真武帝君在梦中所传大道里的一点内容。”

他说得一脸认真,黄蓉却根本不信这些,反倒嗤笑一声。

易逐云也不在意,将草纸放在桌上,用炭笔指着说道:“你计算时的余数,其实就是我的‘x?2 减三’,而分母‘2x?’恰好与倍商法相符。”

说着,他又拿来一张空白纸,建立坐标系后,在上面绘出一条抛物线切线,解释道:“这‘流数术’,实则就是你的‘借算’连续化。”

接下来,他直接给黄蓉讲解起“导数”。

瑛姑、朱子柳、裴九章和墨策等人也都凑近仔细聆听。

黄蓉盯着他手中炭笔,认真听他讲解,突然眼睛一亮,一把夺过笔在纸上飞速书写:“设天元为Δ,则:新商等于原商减去‘原商2 减三’除以‘二乘原商’ 。”

瑛姑面露惊色,说道:“这……这便是求周径术的变式!”

说罢与黄蓉相视一笑。

几个精通算术的人面面相觑,无不激动万分。

裴、墨二人相视一笑,满脸欣喜地说道:“确实是求周径术的变式!”

几人随即讨论起来,各自取来纸笔,想要亲自验证一番。

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