Chapter 299 (2/2)
Once again, Cheng Nuo, who is sleeping soundly, is awakened by Xu Jie.
By the bed, Xu Jie has already dressed up, ”the plan of the day is in the morning, classmate Cheng Nuo. In the good morning, you can't go to sleep in vain. Come and play sports with me.”
Cheng Nuo was forced to get up, he rubbed his sleepy eyes, ”then we go downstairs for a morning run?”
”No, No Xu Jie shook his head. ”Running is too low. We should have a unique way to do morning exercises.”
Cheng Nuo: ”so?”
Xu Jie scratched his head and laughed, ”so I created a set of” function dance. ”The ”function dance” invented by Xu Jie is to construct various basic function curves with the body.
Cheng Nuo is forced to jump.
Y = SiNx, sine function, bending the arm and swinging the wave.
Y = x, linear function, one hand side up, one hand side down, 45 degrees.
Y = (1-x) ^ 2 + 3 √ x ^ 2, cardioid, bicenter!!!
…………
Sweating and panting.
After breakfast, Cheng Nuo and Xu Jie separate and join their respective teams, and take the bus to the final examination site.
The test time is the same as that of the preliminary contest. It starts at 9:30 and has three hours to answer questions.
However, in terms of test questions, the final questions are not only higher than the final in terms of difficulty, but also add two additional questions.
Each additional question is ten, the score is not much, but the difficulty is not small. The two questions are handled by two mathematicians themselves.
In the past years, candidates who were able to answer the last two additional questions correctly on the premise of answering the previous questions could only be described by the number of their fingers.
At nine o'clock sharp, more than ten people from Tsinghua University arrived at Mordo University, where the test site is located.
At half past nine, the examination begins.
At 10:10, Cheng finished all the previous questions, leaving only two additional questions.
Additional question 1: [for polynomial f (x), let D (f) denote the minimum real root distance represented by its maximum sum. Let n ≥ 2 be a natural number and find the maximum real number C such that for any real root 】
additional question 2: [suppose x1, X2 Xn is an independent and identically distributed random variable. It has a common distribution function f (x) and a density function f (x) Xn, reorder in order of size 】
sure enough, both the starting point and the operation process of the problem are more troublesome than the previous problems.
But still that sentence, to Cheng Nuo, this is not a matter.
The examination lasted for an hour.
Cheng Nuo came out of the examination room with a pencil bag.
Professor Lu was still sitting with Professor Liu, but this time he was smart and didn't make any bets with Professor Lu.
”Lao Lu, you are a very good student!” Seeing the coming Cheng Nuo, Professor Liu said with half emotion and half envy.
Professor Lu laughed and did not answer.
An hour later, Xu Jie returned from the examination room in advance.
Fortunately, Professor Cheng Nuo is still sitting next to him this year. Cheng Nuo, you just came out? ”
Cheng Nuo said, ”sorry, I came out an hour ago.”
Xu Jie: