Mathematical problems are generated by counting, calculating, measuring and observing the shape and motion of objects through abstract and logical reasoning.

Mathematical problems can be roughly divided into fill-in-the-blank questions, true and false questions, multiple-choice questions, calculation questions, application questions, proof questions, drawing questions, thinking questions, reading questions, regular questions and problem solving. Skillful problem solving depends on the flexible use of the knowledge you usually study.

True or false answer: the correct answer is marked √ in the back bracket, and the wrong answer is marked × in the back bracket. Sometimes options A and B are used.