对于一些看起来较复杂的整式方程、分式方程和无理方程,在解方程时,我们总想尽力消元以减少元的个数求解,但在解某些方程时,情况恰好相反,巧妙地增设元,使方程由一元变多元,方程反倒容易求解,不妨称这种方法为增元法.本文旨在说明用增元法解某些特殊的方程.现分类举例说明如下,供参考. For some seemingly complex equations, fractional equations, and irrational equations, we always try to eliminate the element to reduce the number of elements when we solve the equation, but when solving certain equations, the situation is exactly the opposite. Addition of yuan, so that the equation from a variable multivariate, the equation is easy to solve, you can call this method as a method of increase. This article aims to explain the use of the incremental method to solve some special equations. The classification is illustrated as follows, for reference.