Jun Ge, PhD in Education, Senior Coach of The Chinese Mathematical Olympiad, Principal of The Associated High School of Nanjing Normal University, China.

• Quadratic Equations; The Equations That can be Transformed Into the Quadratic Equations; The Discriminant of a Quadratic Equation; The Relationship Between Roots and Coefficients and Its Application; Simultaneous Quadratic Equations with Two Unknowns; Integer Roots of a Quadratic Equation; Perfect Square Numbers; Quadratic Functions; Quadratic Inequalities; The Distribution of Roots of a Quadratic Equation; Maximum and Minimum Values of Quadratic Functions; Maximum and Minimum Values of Simple Fractional Functions; Trigonometric Functions of an Acute Angle; Solve Right Triangles; Rotations; The Basic Properties of Circles; Positional Relation Between a Line and a Circle; Positional Relation of Two Circles; Power of a Point Theorem; Four Concyclic Points; Problems of Geometric Fixed Value; Five Centers of a Triangle; Geometric Inequality; Indefinite Equation; Reductio Ad Absurdum; Extreme Principle; Coloring Problems; Probability;