恒等式x^2=|x|~2在解一元二次方程中的妙用

Some Clever Application of the Identity x^2=|x|~2 to Solve the Quadratic Equation with One Unknown Number

本文介绍了应用恒等式x^2=|x|~2解一元二次方程的几种方法,这一方法的运用,可以化繁为简,避免繁琐的讨论,取得事半功倍的效果。

Some solving processes by the identity x^2=|x|~2 to quadratic equation with one unknown number are recommended in this article. These solving processes can turn the complex to simple one, avoid to complicatedly reasoning and get twice the result with half the effort.