From the above discussion, it can be seen that there are generally three ways of thinking about the deformation of a fraction, namely, the first deformation condition in order to be used, the first simplification of the formula to be worked out in order to make use of the condition, and the simultaneous deformation of the condition and the formula to be worked out, so that the relationship between the two can be easily seen. It's also easier to find deformation techniques that make deformation easier and more Operability.