First, there are only two types of high school series that can be followed regularly, arithmetic progression and geometric series. These two topics are relatively simple. Remember the formula, the summation is also relatively simple, and the use of the formula should be familiar. ?

Second, the topic is often not so simple and easy. The slightly more difficult topic is the combination of arithmetic and some geometric series. Some methods to be adopted here include dislocation elimination. ?

Third, there are various topics, and the frequent finale questions are all common items that have never been touched, and some even don't give connection items. For these two categories, I think we should accumulate the following methods. ?

Fourth, for the topic of summation, Cauchy inequality can be transformed into geometric series summation, denominator scaling, mathematical induction, transformation into functions and other methods.

5. For the problem of finding the general term, we can find the law by substituting evaluation, and then verify it by mathematical induction, or we can use accumulation method or accumulation method.

Mathematics in Senior High School is a book published by People's Education Publishing House, compiled by People's Education Publishing House, Institute of Curriculum Textbooks and Research and Development Center of Mathematics Textbooks. Including set and function, trigonometric function, inequality, sequence, complex number, permutation, combination and binomial theorem, solid geometry and plane analytic geometry.