Mathematics, compulsory education curriculum standard experimental textbook, the first volume of grade nine includes quadratic formula, quadratic equation of one variable, rotation, circle,

Probability consists of five chapters, and the learning content involves four areas: number and algebra, space and graphics, statistics and probability, and subject learning.

There are many tutorials about the above contents. It is suggested to select 1-2 copies according to the above contents. Don't choose too much, otherwise it will increase the study burden.