论文部分内容阅读
高考试题来源于课本中的例、习题是近年高考命题的一个亮点,体现了考试说明中的源于教材又略高于教材的思想.本文以普通高中课程标准实验教科书数学必修5第18页练习第3题为例说明.供参考.题目在△ABC中,求证:a=bcos C+ccos B,b=ccos A+acos C,c=acos B+bcos A.该习题的证明方法灵活多样,可借助正弦定理化边为角,再用两角和的正弦公式获证;可借助
Examination questions come from the textbook examples, exercise is a bright spot in recent years college entrance examination proposition, reflecting the interpretation of the test from the textbook and slightly higher than the textbook thinking.This article to ordinary high school curriculum standard textbook compulsory math 5 page 18 practice The third title is an example for reference. The title is in ABC, verify: a = bcos C + ccos B, b = ccos A + acos C, c = acos B + bcos A. The proof of the problem is flexible and diverse, With the sine edge of the law can be modified, and then the two corners of the sine formula certified; can help