If you want to learn, the function is more difficult. Although it accounts for a large proportion in the exam, in fact, most of them still emphasize the basics, so don't worry too much about this one. On the contrary, although the sequence only occupies one chapter in the senior high school curriculum, we have to emphasize its flexibility (and its close combination with functions), which requires a certain foundation for the cultivation of small olympiad. Moreover, it is not difficult to see that after entering the general review from the third year of high school, many difficult and big questions in this series are placed in the last two finale questions, which shows its great difficulty.

Similarly, analytic geometry. At the beginning of the first round of study, you may not find functions and series difficult, but by the end of senior three, you will know that the big problem represented by this piece is often recognized as a rote problem in the college entrance examination, because solving it is a quite complicated process and requires super-skilled operation skills in solving equations. The so-called analytic geometry is to solve geometric problems with algebraic equations, and learning this well requires considerable calculation and accumulation.

When learning mathematics, you should learn to analyze yourself. Mathematics is your weak subject. The weaker you are, the less you can learn in a muddle. A classmate asked him which math was difficult, and he couldn't tell what it was. In a word, it's difficult everywhere, which is the biggest headache. Actually, it won't, mostly because of difficulties. If you find and overcome the difficulties, then the problem will be solved.