Scaling is the final question in the college entrance examination, but it is rarely tested in the college entrance examination, and candidates rarely think of ways to solve problems.

In fact, the key to scaling method is reasonable scaling, neither too much nor too much. Only when we meet a specific topic, we should consider how to measure it from the type and essence of the topic. It can't be summed up in one word. Judging from the college entrance examinations over the years, the scaling method has not been tested. Scaling method is not a powerful tool to solve the sequence of numbers. The difficulty of limit lies in finding some complex limit sums that tend to infinity, or deriving formulas. Scaling method is widely used in proving inequalities. College entrance examination questions may be mixed with series. When it comes to problem-solving skills, we can only understand them by summing up and thinking.

Often when the known method is not enough to solve the problem, we should consider using the method of reverse thinking to scale some numbers and make up the numbers related to the problem. You can understand the above example. Step by step, one by one. If you can use it skillfully, you can use the zoom method flexibly.