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近年来,小学数学竞赛中屡见一类探究性(或称开放性)题,即给出题目的条件而答案不唯一,需要学生探讨分析出题目的结果,这类题若靠“硬凑”或“机械运算”,是相当费时费力的,甚至难于解决。笔者在教学中用一般化(或特殊化)分析法启迪学生的智力思维,引导他们探究这类题,有效地提高了学生的应变能力和解题能力。 例1 商店里有两种笔记本,厚的每本7角5分,薄的每本4角5分。李老师买笔记本正好用去12元。他买了几本厚的笔记本,几本薄的笔记本?把每一种答案填写在下面的表里(格子不够自己画)。
In recent years, primary school mathematics competition often see a class of inquiry (or open) questions, that is given the conditions of the topic and the answer is not unique, need students to explore the results of the analysis of the title of such questions by “hardcore” Or “mechanical operation” is quite time consuming and laborious, and even difficult to solve. The author uses generalization (or specialization) analysis method to enlighten students 'intelligence thinking in teaching and guides them to explore such questions, which effectively improves students' adaptability and problem-solving skills. Example 1 There are two kinds of notebooks in the store, thick 7 points for each 5 minutes, thin 4 points for each 5 minutes. Mr. Li bought a notebook just spent 12 yuan. He bought a few thick notebooks, a few thin notebook? Each answer fill in the table below (grid is not enough to draw).