第71章 家庭教师
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第71章家庭教师
清秋的午后,暖融融的阳光透过陆公馆书房的雕花玻璃窗,洒在梨花木书桌上。
陆小曼正趴在桌前,手里攥着一支铅笔,眉头紧紧皱着,盯着纸上的题目咬着笔杆,腮帮子微微鼓着,一副百思不得其解的模样。
直到从窗玻璃的倒影里看到那个熟悉的身影,她才猛地回过头,先是故作不满地撅了撅嘴,随即又忍不住弯起眉眼,露出一抹浅浅的笑意:「你来了?陈老师?我还以为你早把这事儿忘了呢!」
「哪能呢,陆同学。不过你可不像是尊师重道的样子!」
陈华隐笑着顺势在她身侧的椅子上坐下,目光扫过桌上的稿纸,问道,「倒是我小瞧你了,竟这么用功,一早在这写数学题?」
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只见宣纸之上,用端正的小楷写着一道题目:鸡犬同栏,共头一百,共足三百二十,问鸡犬各几何。
陈华隐一眼扫过,忍不住哂笑一声。
这不就是经典小学数学题鸡兔同笼嘛!把兔子换成狗又是何意味啊?
再看旁边的稿纸,陆小曼已经写写画画了好几页,显然是对着这道题琢磨了好一阵子,也没算出个结果来。
「陆同学可是要考北大的人,平时总做这么简单的题可不行。」陈华隐拿起稿纸,笑着调侃道。
「你胡说什么呢!」谁料陆小曼闻言却是立即气鼓鼓地抢过稿纸,瞪了他一眼,「这可是北大前年自主招生考试的文科真题,是我父亲好不容易才弄来的!
哪里简单了?」
陈华隐闻言,颇有些惊诧。
合着民国人也知道考试前要去找历年卷是吧?不过堂堂北大的文科招生题,竟然就考这个?这难度,放在后世连小升初的门槛都够不上,未免也太简单了些。
陆小曼见他这副模样,更是气不打一处来,把纸笔往他面前一推,叉着腰道:「你别光说简单!人家题干上可写得明明白白,禁用代数演算,须用纯算术法求解!我倒要看看,你这个当老师的,能有什么好法子解出来!」
陈华隐不由得失笑,这倒是有点意思了。
任谁都知道,列二元一次方程是解鸡兔同笼类问题最简便的法子,这北大的命题老师,偏偏要禁用代数,逼着学生用纯算术法硬解,倒是颇懂得难为文科学生的门道。
不过这点小把戏,在他这个久经考场的做题家面前,实在是不够看的。
「这有何难?」陈华隐拿起笔,在纸上随手画了一百个小圆圈代表头,笑着道,「你看,咱们先让栏里的鸡和犬,全都抬起两只脚。一共一百个头,每只抬两只脚,剩下的脚就都是犬的,如此不就轻易得解了?」
陆小曼看着纸上的演算,眼睛瞬间瞪得圆圆的,满脸的不可思议:「竟然还能用这种方法解?」
可她随即又皱起眉,摇着头反驳道:「不对不对!这解法根本就是错的!鸡一共就两只脚,全都抬起来了,怎么可能站得住?哪里有这样算题的!」
陈华隐被她这较真的模样逗得哈哈大笑,放下笔道:「若是陆同学觉得抬脚法不妥,那我换个法子也成。咱们不抬脚了,直接把每只动物都砍掉两只脚,题目照样能解,就是这些可怜的鸡犬丢掉的脚,只能找陆同学来赔了。」
陆小曼愣了愣,随即反应过来,这砍脚法和抬脚法本质上是一个道理,不过是换了个说法罢了。她顿时又气又笑,伸手拧了一下陈华隐的胳膊,嗔道:「就你这样还当先生呢?一点也不知道循循善诱,就知道拿这些歪门邪道的法子糊弄我!」
「我这才叫因材施教呢。」陈华隐笑着躲开,「寻常人,可没有得我倾囊相授的机会。」
见陆小曼依旧在一旁气鼓鼓地鼓着腮帮子,陈华隐连忙岔开了话题,目光扫过紧闭的书房门,压低声音问道:「话说回来,你吴叔竟也同意我来给你当家庭教师?」
他这话倒不是随口一问。毕竟吴长青当初给自己那些选择,他可是一个都没遵照。可这次来时对方虽然脸色不太好看,但也没说什么,终究还是放他进了陆公馆的书房,实在是出乎他的意料。
陆小曼闻言,脸颊瞬间泛起一层淡淡的红晕,低下头捻着衣角,半天没说话。
陈华隐瞬间便明白了,想来是这位大小姐又软磨硬泡,磨了她父亲许久,才换来这么个机会。当真是美人恩重,他心里不由得泛起一阵暖意。
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