第一百四十章 一元一次方程
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“李祭酒，解题就算了，今天我来这里是想请教你一些关于那个镜片的问题的，那天我见姑母给祖父送上一副老花镜，竟然可以让他看清近处的东西，这到底是原因？”李承道却对李休让自己去解算学题目的建议并没有兴趣，毕竟在他看来，小自己几岁的七娘肯定也只会做一些最初级的题目，根本没什么可算的，还是老花镜的问题更让他感兴趣。龙腾小说网ltxsba.com
“呵呵，老花镜的原理可不是一句两句就能解释清楚的，想要彻底搞清楚其中的原理，就必须拥有极为高深的算学基础，所以郡王还是去把那道题目解出来再说吧！”李休淡笑着开口道，老花镜的原理看似简单，但却是一个物理方面的光学问题，还涉及到光线折射等方面的计算，所以李休说需要数学基础也没错。
听到李休如此说，李承道也有些半信半疑，这时平阳公主一脸严肃的开口道：“道儿，既然你想来李祭酒这里求教，就要听从李祭酒的安排，否则你还不如回宫里跟着几位夫子学习！”
“是，侄儿明白！”李承道听到姑母的话也终于醒悟过来，说完再次向李休行了一礼道，“刚才是承道有些糊涂了，还望李祭酒不要怪罪，我这就去解题！”
李承道说完刚准备去凉亭里，不过这时平阳公主却是再次开口道：“道儿，你既然向李祭酒求教，虽然没有真正的拜师，但也不能太过生疏了，我看就你叫李祭酒为先生，李祭酒也不用和道儿太客气了，直呼他的名字就行了！”
“姑母说的极是，承道拜见先生！”李承道极为机灵，听到这里立刻改变称呼向李休行礼道，说起来他祖父李渊只是同意让他向李休求教，但并没有让李休做他的老师，所以称呼李休为“先生”倒也十分恰当。
平阳公主都这么说了，李休也不好再拒绝，而且一直要对李承道这个小屁孩子尊称为郡王，他也感觉有些不舒服，所以这时也顺口应道：“承道你也不必多礼！”
看到李休答应，李承道当下也很是高兴，随后这才再次行礼离开，来到凉亭里看题目。七娘正趴在桌子上咬着毛笔头，一脸纠结的表情，李承道进来后她只是看了他一眼，随后继续咬笔头，这道题目对她来说还是有些难度，暂时还没有理清思路。
看着七娘纠结的表情，李承道却是淡定的一笑，他对自己的算学相当有信心，毕竟他可不认为李休会给七娘这样的小孩子出什么难题。不过李承道脸上的笑容没能维持太久，当他看到七娘面前的题目时，却一下子愣在那里，因为这道题目他竟然看不懂，确切的说是有些像是鬼画符似的东西他根本不认识，其它的倒是能看懂。
李承道万万没想到自己竟然连题目都看不愣，有心想要回去问李休，却看到他和自己姑母似乎聊的十分开心，而且自己连题目都看不懂，实在让他感觉很没面子，也不好意思去问李休，这也让他也露出一副纠结的表情。
不过很快李承道就发现了事情的转机，因为他看到七娘面前的草稿上写着不少相同的符号，这说明她肯定认识，于是最后厚着脸皮轻声问道：“小妹妹，题目上的那些符号是什么意思啊？”
七娘正在思考着这道题目的关键，忽然被李承道打断了思路很是不高兴，当下白了他一眼道：“你没玩过纸牌吗？”
“纸牌？我好像听说过，但是没玩过？”李承道这时也有些不好意思的道，因为七娘说话时，好像纸牌应该人人都会玩似的。
“真可怜，连纸牌都不会玩！”七娘听到这里有些同情的看了李承道一眼，随后提起毛笔在纸上写出十个阿拉伯数字，以及相对应的汉字道，“好了，你自己看吧，有什么不懂的再问。”
李承道还是第一次被人说他可怜，而且对方还是个小他几岁的女孩，这让他也不由得涨红了脸，甚至连眼睛都不敢看七娘，只好紧盯着纸上的数字，然后将它们一一记在心里。
李承道本来就有数学基础，而且又聪明无比，所以在认识了十个数字符号后，又向七娘询问了一下数字排列的规律，很快就明白了题目的意思，不过题目是看懂了，他脸上却再次出现了几分苦笑，因为他也不会解这道题。
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