论文部分内容阅读
同学们都知道选择题具有构思巧妙、概念性强、灵活性大、知识面广等特点,它主要用来考查同学们的基础知识和基本技能是否扎实。在解题时,要根据所学的数学知识,由题目的已知条件去确定符合题意的选择项。常用的方法有以下几种:一、直接法:从题目的已知条件出发,直接把有关概念、定义、性质、法则与结论联系起来,通过分析比较,从中找出正确答案。【例1】下面的分数中,不能化成有限小数的是()。A.9/16 B.7/8 C.5/24 D.4/5分析与解:一个最简分数,如果分母中含有2和5以外的质因数,这个分数就不能化
The students all know that the multiple choice questions have the characteristics of ingenious ideas, strong conceptualization, large flexibility and wide range of knowledge. It is mainly used to check whether the students’ basic knowledge and basic skills are solid. When solving a problem, according to the mathematics knowledge learned, by the known conditions of the topic to determine the eligible questions. Commonly used methods are the following: First, the direct method: starting from the known conditions of the title, directly related to the concept, definition, nature, law and conclusion, through analysis and comparison, to find the correct answer. [Example 1] The following scores, can not be turned into a finite decimal (). A.4 / 16 B.7 / 8 C.5 / 24 D.4 / 5 Analytical reconciliation: a simplest fraction, which fails if the denominator contains a prime factor other than 2 and 5