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随着互联网和电脑的普及,网络时代已扑面而来.在这样的环境下,数学教学也面临与时俱进的问题.常常有学生拿网上的一些数学题来问老师,笔者在浏览网页的时候,也会看到各种各样、形形色色的数学问题.既然学生很喜欢问网上的问题,为什么我们老师不可以拿过来作为教学的一种鲜活的题材呢?为此笔者收罗了网络上一些有代表性的题目,作为数学课堂教学和第二课堂的案例,收到了良好的教学效果.案例1神奇读心术[1].这个问题历久弥新,总能误导不少的人.说到底这是一个数学魔术,但缺乏数学素养的人基本上看不出当中的缘由。题目是这样的:任意选择一个两位数(或者说,从10～99之间任意选择一个整数),把这个数的十位与
With the popularity of the Internet and computers, the Internet age has come in. Under such circumstances, mathematics teaching is also facing the problem of keeping pace with the times.Often there are some students to take online mathematics questions to ask the teacher, the author is browsing the web When, also can see all sorts, all sorts of mathematics question.Since the student likes to ask the online question, why can not our teacher take as a teaching fresh subject? For this author has collected the network Some representative topics, as a case of mathematics classroom teaching and the second classroom, received good teaching effect.Case I magic mind reading [1] .This problem is timeless, always misleading a lot of people. This is a mathematical magic, but the lack of mathematical literacy people basically can not see the reason. The question is this: arbitrarily choose a double digit (or, from 10 to 99 arbitrary choice of an integer), the number of ten and