1.误用连等例1 解方程3-2x=9. 错解3-2x=-2x=6=x=-3. 分析解方程时一定要注意同解变形与恒等变形的区别.这是两个不同的概念,方程3-2x=9和-2x=6的解虽然相同,但经过移项变形之后,等号两边代数式的值已经发生变化,导致出现了“6=x=-3”的矛盾情形.因此 1. Misuse contingency example 1 Solve equation 3-2x=9. False solution 3-2x=-2x=6=x=-3. When analyzing the solution equation, be sure to pay attention to the difference between the same solution deformation and the constant deformation. There are two different concepts. Although the solutions of Equations 3-2x=9 and -2x=6 are the same, the value of the algebraic equations on both sides of the equal sign has changed after the transpositional distortion, resulting in the appearance of “6=x=-3”. "The contradictory situation. Therefore