No matter how long each question takes, you must get high marks in mathematics. Multiple-choice questions and fill-in-the-blank questions must be completed within 45 minutes to 60 minutes, and the accuracy of the questions must be guaranteed. Otherwise, it is difficult to get high marks. The following nine questions are completed within 2 hours, with an average of one question 13 minutes. It should be noted that it must be easy before difficult. Try your best to solve the problem.