The core of mathematics is functions, including sets and basic inequalities, properties and images of functions, exponential functions, power functions, trigonometric functions, etc., among which basic inequalities and trigonometric functions are the core test points.
Mathematics, physics and chemistry are several science subjects, mathematics is the most closely practiced Xi in junior high school and high school, especially the function part, the quality of the junior high school function Xi often directly affects the grades of high school.
Many junior high school Xi so-called high-scoring students rely on the model of doing questions, and on the basis of the concept of function is not really understood, they still do the questions, this way of learning Xi is acceptable in junior high school, and when the change of the question type in high school begins to increase, the more you learn the essence of the function, the more you learn, the more you learn, the more confused.
Functional thinking is the foundation of high school mathematics, prospective high school students can first start from the quadratic function to Xi, not to apply that concept as a topic, for high school has no meaning, but to study the principle understanding of the concepts of function translation, intersection, interval value, can do inferences, high school function part is only an extension on this basis.