Five books are needed. According to the query, the third grade network shows.

1, Shenyang Mathematics: 5 required books, 2 required books in the first half of senior one and 3 required books in the second half.

2. Compulsory courses in senior high school refer to the courses that must be completed in senior high school. These courses are an important basis for students to master basic knowledge and cultivate basic abilities, and are also the basis for students to learn, develop and grow.