本文中笔者对一道课本习题的证法进了多角度探究.在解题教学中,一题多解有助于发展学生的逻辑思维能力与拓宽学生的知识视野,进而有助于提高学生的解题能力与探究能力.本文值得我们广大师生学习与参考. In this paper, the author of a textbook exercises into a multi-angle card law.In the problem-solving teaching, one problem more solution helps to develop students’ logical thinking ability and broaden the students’ field of vision, which in turn helps to improve the students’ solution Title ability and inquiry ability.This article deserves our teachers and students to learn and reference.