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解决题通常要先厘清题目的数量关系,但很多问题非常抽象,这时画图可以帮助同学们清晰地找到数量关系,从而找到解题思路。例:刘老师对全班60名同学进行兴趣调查,其中有42人喜欢语文,有46人喜欢数学,有50人喜欢外语,有55人喜欢体育。可以肯定至少有多少人四门学科都喜欢?分析与解答我们可以先去掉“有50人喜欢外语,有55人喜欢体育”这两个条件,只考虑同时喜欢语文、数学的有多少同学,画出示意图,:
Solve the problem usually first to clarify the relationship between the number of questions, but many problems are very abstract, then drawing can help students to clearly find the quantitative relationship, so as to find a solution to the problem. Example: Mr. Liu conducts an interest survey on 60 classmates in the class. Of these, 42 prefer language, 46 prefer math, 50 prefer foreign languages and 55 prefer sports. Can be sure at least how many people like four disciplines? Analysis and Solution We can first get rid of “50 people like foreign languages, 55 people like sports” these two conditions, only consider the same time, like Chinese, math how many students , Draw sketch map: