Chapter 11: Super difficult Mathematical Olympiad

　　 One afternoon, two sessions of English and two sessions of physics. Cheng Nuo spent almost all of his time studying his own abilities.
　　 After this morning, Cheng Nuo felt that his ability did not seem to be that tasteless.
　　 Your own eyes can digitize everything, and your own brain has that powerful and accurate computing power like a computer.
　　 With the cooperation of the two, many things can be accomplished.
　　 For example, if you want to go to a certain place, your brain will calculate the most time-saving route based on the data provided by Cheng Nuo.
　　 The body wants to complete a certain action, and the brain can also give the most time-saving and energy-consuming muscle exercise method for this action.
　　 Moreover, with the help of the data in his mind, Cheng Nuo's control of the body has reached an extremely precise point.
　　 If you want to use 5 N, you will not use 5.1 N.
　　 If you want to jump 0.2 meters, you will not jump 0.19 meters.
　　 I want to run at a speed of 10 meters per second, uh... that's it. The abilities didn't change Cheng Nuo's physique. He was still the weak chicken who could only run 14 seconds in 100 meters.
　　 Also, Cheng Nuo discovered that in addition to mathematics, physics, and chemistry, two subjects dealing with numbers and data, Cheng Nuo can also easily solve related subjects. Whether it is simple or difficult. As long as Cheng Nuo glanced at it, his mind proved that he could basically come up with a clear idea of ​​solving the problem.
　　 This discovery made Cheng Nuo happy for a long time. Xueba, I really still have the life of Xueba, haha!
　　 However, this ability is not useful for the three subjects of English, Chinese and Biology, which makes Cheng Nuo very regretful.
　　 Doesn’t mean that you learn mathematics, physics and chemistry, and you are not afraid to travel around the world! It would be great if the college entrance examination only took the three subjects of mathematics, physics and chemistry.
　　Hey, I can only hope that this time the college entrance examination Chinese and English biology is not too difficult.
　　 As for mathematics, physics and chemistry? Hey, naturally the harder the better!
　　 At this time, in the math group office, Old Tang frowned and fell into deep thought while holding a test paper.
　　The signature of the test paper is Cheng Nuo...
　　………………
　　 "Cheng Nuo, Old Tang is looking for you." Before the evening self-study class, Jiang Qingqing, the math class representative, returned to the classroom with a stack of test papers.
　　 "Look for me? What's the matter?" Cheng Nuo shivered when he heard Old Tang's name.
　　 Could it be that Old Tang knew about the lunch in the cafeteria? But no fight, Old Tang won't find me because of this!
Jiang Qingqing held the exam papers for the morning exams. While asking her classmates to send them down, she answered Cheng Nuo's words, "I don't know this, but it doesn't seem to be a good thing to look at Lao Tang. Caused trouble?"
　　 Why did Jiang Qingqing say "again"?
　　 Cheng Nuo belongs to the kind of person who never makes big mistakes and keeps small mistakes. It was not once or twice that Tang was called to the office alone.
　　 In Jiang Qingqing's eyes, "The wind is cold and the water is cold, and the strong man goes and never returns", Cheng Nuo goes to Tang's office.
　　 Sure enough, as soon as Cheng Nuo entered the door, he saw Old Tang's stern face.
　　 "Teacher, are you looking for me?" I had no choice but to bite the bullet.
　　 Old Tang glanced at Cheng Nuo whole body with sharp eyes, and sighed softly.
　　He took the test paper that Cheng Nuo had made this morning, it was full of check marks, and the score of ‘150’ on the front was extremely bright red.
　　 "Did you do this?"
　　 Cheng Nuo looked at the test paper with his name clearly written on it, and nodded, "Yes, isn't my name written on it?"
　　 "I mean you did it yourself. Are there any speculations?"
　　As Cheng Nuo's math teacher for two years, Lao Tang naturally knows Cheng Nuo's mathematics level. It can only be said to be so-so, not good, not too bad. But this test paper is definitely not something that Cheng Nuo can complete, and a full score of 10,000 is impossible.
　　 Therefore, Old Tang suspected that Cheng Nuo did it by means of speculation. As Cheng Nuo's math teacher and head teacher, Lao Tang felt it necessary to stop such behavior in time.
　　 Old Tang turned on the "Tang Monk" mode and taught Cheng Nuo with a persuasive voice.
"Cheng Nuo, I know your grades. I can understand your idea of ​​improving grades, but you can't use those crooked ways. With your grades, no matter how hard you work during this period, you may not have no hope of getting admitted. A key university... right now... right now..."
　　 After half an hour, Old Tang seemed to be a little tired, so he stopped to drink. Cheng Nuo finally found the opportunity to intervene.
　　 "Teacher, you have to believe me, I really didn't cheat in this exam!"
　　 Cheng Nuo is also suffering.
　　 Old Tang said for so long, Cheng Nuo understood what Old Tang meant. Old Tang saw that he actually got a perfect score on this test paper, which was completely inconsistent with his previous performance, so he suspected Cheng Nuo of cheating.
　　 Hey, if I knew this was the case, I won't pretend to be forced to do so. How good is it to finish this set of test papers at my usual level!
　　 When Old Tang saw that he had been teaching him for so long, Cheng Nuo still refused to admit it, and became angry for no reason.
He patted the table and said, "No cheating! Since there is no cheating, how did you make such a difficult question?! Don't tell me that your brain suddenly opened up. If your brain suddenly opened up, take this question. Try it for me."
　　 The most indispensable math teacher is all kinds of strange and difficult math problems. In order to make Cheng Nuo completely give up, Lao Tang directly gave Cheng Nuo an Olympiad problem.
　　 This Mathematical Olympiad question is not easy. This is a question in an Olympiad three years ago.
　　 It is said that UU reading www.uukanshu.com was written by only a dozen of the thousands of students participating in the competition.
　　 "As long as you can figure this out here today, I believe you are not cheating!"
　　 "Really?"
　　 "What I said is still false?"
　　 "But the last time your physical education teacher asked for leave, it turned out..."
　　 "Go away and write quickly."
　　 Cheng Nuo took the question from Old Tang.
　　 The distance TA=a, TB=b, TC=c, TD=d from a point T to the four vertices in the tetrahedron ABCD, find:
　　 1. The maximum volume of tetrahedron ABCD and the conditions for taking the maximum value.
　　2. The maximum surface area of ​​tetrahedron ABCD and the conditions for taking the maximum value.
　　The conditions given in the title are few and simple.
　　 Cheng Nuo glanced, for a moment, there was no clear idea in his mind.
　　 is difficult, this question is difficult! I don't know where Old Tang got such a strange question.
　　 For a while, Cheng Nuo's attention was completely immersed in this question.
　　 In his mind, countless letters and numbers are constantly calculating back and forth, and a clear idea of ​​problem-solving gradually formed in Cheng Nuo's mind.
　　 Old Tang stood there blankly when he saw Cheng Nuo, thinking he had no idea at all.
So Old Tang pointed to an empty seat opposite to him and said, "There is an empty seat over there, you can sit there and do it. It is 8:10, to 10, as long as you can make this before 10 o'clock. Just calculate the question. Of course, you can give up halfway."
　　 Seeing Cheng Nuo sitting opposite him, writing and drawing on a piece of paper, Old Tang smiled faintly, then stopped paying attention to Cheng Nuo's side and prepared to start his own lesson plan.
　　 This kid will give up in less than half an hour!