Prove a>b, then only A-B >; 0. This is the "difference comparison method".
The analysis is as follows:
example
The method of comparing the sizes of two real numbers is the difference method: Steps: ① Make the difference between the two numbers; ② Compare the differences with the size of 0; 3 draw a conclusion?
This method of using difference converts the ratio of two numbers or two formulas into difference sum? 0. It is to compare the size of Central Africa.
Always remember to master important methods.