The following is an introduction to math problems:

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.

Give any number of options, and then put the serial number of the correct answer in brackets. It is not a correct answer, but you must work out the correct answer first, and then put the serial number of the correct option in brackets.

Application problems generally appear in primary school textbooks, and usually only involve four non-operations. In junior high school, we usually solve practical problems for algebraic equations or by solving right triangles. In high school, there are often many means to choose from, such as function, sequence, inequality, derivative, definite integral, oblique triangle and so on.

Please refer to Baidu Encyclopedia-Mathematical Problems for the above information.