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平面向量是高中数学的重要内容,数量积是平面向量的一个重要知识点,是高考经常考查的一个考点。近几年来每年都有高考试题直接考查求数量积,以选择题或填空题的形式出现,这些题目对于学生尤其是文科学生已是较高的要求,如何求平面向量的数量积呢?一般有三种不同的解题思路,下面就以高考试题为例谈谈求数量积的常用方法。例1:(2011年高考上海卷理11文12)在正三角形
Plane vector is an important part of high school mathematics, the number of products is an important knowledge of plane vector, is a test of the college entrance examination often check. Each year in recent years have a direct examination of the entrance exam questions for the number of products, to multiple choice questions or fill in the blank form, these topics for students, especially liberal arts students is already a higher demand, how to find the number of flat vector product? Generally there are three Different kinds of problem-solving ideas, following the entrance exam questions as an example to talk about the number of products commonly used methods. Example 1: (2011 college entrance examination Shanghai Volume 11 text 12) in the regular triangle