Chapter 684: Race against time
In normal math exams, even if the test paper was difficult, she had never been so pressed for time.
Tang Su looked at question 21, which was a question about the combination of number series and probability. This question was worth 12 points. The question was very long, with nearly 200 words and a chart. After reading the question, Tang Su began to think about the direction of this question. In the past, whether it was a simple question about number series or a question about probability and statistics, it usually appeared in question 18 or 19, with a general or medium difficulty. But when it appeared in question 21, the difficulty of the question was greatly increased.
Tang Su thought for about 3 minutes, and only started writing after he had an idea.
The first question is to find the distribution column.
In response to this question, Tang Su first found the distribution function, and then used the distribution function to find the distribution column.
Tang Su then took on the second question, which required him to prove the geometric sequence and write the general formula.
Tang Su touched her head. The problem was really difficult. She had never done such a difficult series problem before.
This question is not about requiring a lot of calculations, but it is about thinking from a different angle from the questions they usually do. It is very novel and a bit tricky.
Tang Su didn't care, because she didn't have much time to think, she just started writing. Proof questions focus on steps, so she wrote out each step clearly. As for how many points she can get in the end, it depends on the examiner.
It took Tang Su 12 minutes to finish the 21 questions.
There are still 20 minutes left until the end of the exam.
Tang Su then looked at question 22, the last question to be answered. This question was very short, only two lines long, and both the first and second questions were proofs. Tang Su remembered that she had studied the chapter on inequalities in the second semester of her senior year, and she did not find this chapter difficult when she studied it.
In normal exams, inequality proof questions are rarely the final questions, and sometimes this knowledge point does not even appear in the solution section. So Tang Su was really puzzled that this point was the final question.
After looking at it for a minute, Tang Su felt that she had no idea, so she immediately turned the test paper over.
She did not forget that she still had 16 fill-in-the-blank questions and 12 multiple-choice questions to finish.
No matter how difficult these two questions are, they can’t be more difficult than the final question.
So Tang Su decided to solve these two problems first, and then do the last problem when he had time.
Tang Su started with question 16. This time she drew a picture directly on the draft paper. She drew half of the court and then a triangle. After she finished drawing, she determined that the knowledge point tested was a question about solving triangles and applying trigonometric functions.
A lot of formulas suddenly emerged in Tang Su's mind, and in an instant, she had an idea. So after a simple calculation, she figured out the answer.
After finishing 16 questions, Tang Su saw that there were still 16 minutes left until the end of the exam.
Tang Su did another 12 questions.
She had an idea for question 12 and had worked out the answer, but the answer was not in the options, so her idea must have been wrong.
Tang Su then changed her method. Instead of calculating the answer directly, she tried the process of elimination. In the end, she eliminated A and B. Between C and D, Tang Su used a method of solving problems that she rarely used, the estimation method. Using this method, Tang Su estimated the value to be 3 times the square root of 3. Tang Su then changed her original choice of D to C.
As for whether it was right or not, she didn't care because she didn't have time to care.
There are 13 minutes left in the exam.
Tang Su spent a minute checking the answers to the multiple-choice questions. After confirming that she had not filled in the wrong answers, she turned to the last page of the test paper and started working on question 22.
(End of this chapter)
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