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分式方程有多种特殊解法,换元是常用的一种.一些分式方程去分母后得到高次方程,不易求解,可试令方程中某个未知数的代数式(通常是二次式或分式)为新未知数.现举例说明如下:
Fractional equations have a variety of special solutions, and the substitutions are common ones. Some fractional equations have high order equations after denominator and are not easy to solve. You can try the algebraic formula of some unknown in equations (usually quadratic or fractional). (Formula) is a new unknown. Here is an example to illustrate: