You have to find a textbook for senior one, learn the knowledge points of the textbook well first, or do the problem like this. You haven't studied the knowledge points of mathematics, and you don't know how to solve problems at all! Bookstores generally have these textbooks to buy, and you can also find a tutoring textbook for middle school mathematics knowledge points.

Learn knowledge points through examples first, and then do more exercises to consolidate:

Online practice in primary and secondary schools: