正文 第七十五章 “快掐他人中，吐白沫了！”(第1页/共3页)
眼看李盘这么肯定，郑恐顿时笑了。有点意思。
这家伙长的跟麻杆似的，还拿个金算盘，想来定然是之前算账之类的事情相当精通，否则不可能这么自信。
可惜啊孩子，你所知道的算学和我所知道的算学，中间可是差了接近一千来年……
“恩……”郑恐摸了摸下巴，笑道：“也罢，那我就先考你一道十岁孩童的题吧。”
李盘自信满满：“请出题。”
安立华安吴壮三人急忙在一旁竖起耳朵，围观这次精彩的战斗。
其实有的时候，文比的精彩程度并不比武比逊色。
郑恐略一沉吟，当即出题：“说，有一口九尺深的井，蜗牛和乌龟同时从井底向上爬。因为井壁滑，乌龟白天向上爬三尺，晚上向下滑一尺。而蜗牛白天向上爬两尺，晚上向下滑一尺。问：当乌龟爬到井口时，蜗牛距井口还有几尺？”
这正是小学二年级奥数中的经典距离问题。
这要是放在地球，对于那些常年做奥数题的小朋友来说绝对不算难，但是问题是，现在是大宋……
读书人每天只知道之乎者也四书五经的大送……
果然，一听到这题，李盘顿时就有点懵了。
这题挺绕。
他一开始是先心算，发现很难算的出来，赶紧拿张纸开始写——
“乌龟每天白天爬三尺，晚上向下滑一尺，也就是每天向上爬两尺。”
“但最后一天向上爬的高度是三尺，因此，乌龟爬到井口需要……需要……”
光是这第一步他就算的晕头转向。
因为这个题可不是单纯的9÷3=3那么简单的，这里面还包括了乌龟向后退的问题。
这个第一步算不出来，后面那就更没法算了。
李盘拿过算盘，算了好一会，终于擦了一下脑门上的汗珠，最后非常肯定的说道：“算出来了，一共需要四天！”
安立三人急忙竖起大拇指：“李盘哥哥厉害！”
继续往下算，这回得算蜗牛爬了多远。
李盘继续：“蜗牛每天只能爬二减一等于一尺，所以蜗牛第四天共爬了四尺，此时蜗牛距离井口就是九减四等于五尺！”
终于算完，李盘长出口气，浑身都快湿透，不过好歹是算出来了，把答案往前一推：“结果是还剩五尺！”
&n
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