Elementary algebra exercise book I

The series of elementary algebra exercise books is designed for undergraduate students with any background and senior high school students who like challenging problems. This series should be useful for non-math college students to prepare for GRE general test quantitative reasoning and GRE subject test mathematics. All the books in this series are independent and helpful for learning elementary algebra knowledge. The number of stars represents the difficulty of the problem: the least difficult problem has zero star and the most difficult problem has five stars. With this difficulty indicator, each reader can easily pick suitable problems according to his/her own level and goal.