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一道题做出解答后,再进行有效的检验,是解题的一个重要环节,它不仅能提高解题的正确性,而且还能增强思维能力。养成检验的习惯,掌握几种简易的检验方法,对于提高学习效率和两个能力。有着积极的指导意义。本文就常用的几种简易检验方法作如下介绍: 一、代回原题作检验: 例1 设sinα、cosα是方程8x~2+6mx++2m+1=0的二根,试求m的值。解由韦达定理得①式两边平方得sin~2α+2sinαcosα+cos~2α
After a question is answered, an effective test is an important part of the problem. It not only improves the accuracy of the problem, but also enhances the ability to think. To develop the habit of testing, to master several simple test methods, to improve learning efficiency and two capabilities. Has a positive guiding significance. In this paper, several commonly used simple test methods are described as follows: First, the original back to the original test for testing: Example 1 Let sinα, cosα is the root of the equation 8x~2+6mx++2m+1=0, try m value. The solution is obtained by the Weida Theorem. The squares on both sides are sin~2α+2sinαcosα+cos~2α.