if| p1-p2| Because f (a)=f (b), the interval [a, b] is symmetrical with respect to the line x=p1. Since the decreasing interval is [a, p1] and the increasing interval is [p1, b], the length of the monotonic increasing interval is (b-a)/2. Simple and direct! The answer was given in seconds! Zhang Ruiyun, who was outside the door, was dumbfounded. After the students in the class saw Wei Minghai's answer, they were stunned for a few seconds before they recovered. "No more?" "Just, just like that?" "No, that's impossible, right?" "The previous idea filled the entire blackboard. Why is this idea so simple?” "Tell me about it! Wei Minghai!" Wei Minghai looked at Xu Heng. Xu Heng gave up the podium and sat down in an empty seat at the back. "Teacher! Try the recliner!" Xu Heng refused. Wei Minghai began his narration. Zhang Ruiyun was confused, but he was sure that everything Wei Minghai said was beyond the scope of the book! "Wei Minghai really knows it! He didn't mean to make things difficult for Teacher Zhao!" "He's like a genius in martial arts novels who suddenly opened up the Conception and Governor Meridians!” "I'm rich! He was rich! Our Cloud Lake High School is going to be rich!" "You must tell the principal! He had to inform the principal immediately!” "In this year's Mathematical Olympiad competition, as long as Wei Minghai can get a good ranking, he will be guaranteed a good university!” "If there are students from our Fifth High School who are guaranteed entry, what would happen? Not to mention No. 4 High School and No. 3 High School, No. 2 High School hadn't had any students who had been recommended for admission in the past few years! Who couldn't weigh the weight of this!” Zhang Ruiyun rushed to the principal's office. "Principal? Principal Gu! Principal, are you there?" In the principal's office. Principal Gu Jijian was looking at the materials. Zhang Ruiyun could not hide the joy on her face as she hurriedly knocked on the door and entered. He was stunned." Director Zhang, what's wrong?” Zhang Ruiyun said," Principal! I have good news for you!" Gu Jijian lowered his eyebrows and raised his hand to push up his glasses." Director Zhang, it should be bad news, right? How is it good news?" "I heard about Teacher Zhang's matter! How can you say that it's a good thing when you're so angry that you're in the hospital?” Zhang Ruiyun was excited." Principal! This was a good thing! So be it!" Gu Jijian was stunned. This was the first time he had seen Zhang Ruiyun with such an improper attitude. "Director Zhang! What do you mean? Are you…" Was he floating? Before he could ask, Zhang Ruiyun said," Principal! I found out that our school has a good seedling who can be recommended!” As soon as he said this. Shua! Gu Jijian immediately stood up, took off his glasses, and glared at Zhang Ruiyun." What did you say?!” Zhang Ruiyun said," Principal, I said that I found a good seedling that can be recommended! In the second year of high school!" Gu Jijian's first reaction was," Which class? Class 1? Or Class 29? Do I have any impression of it?" Zhang Ruiyun shook her head. Gu Jijian knew the importance of a guaranteed entry to Fifth High School. Cloud Lake had No.1 Middle School, No.2 Middle School, No.3 Middle School, No.4 Middle School, and No.5 Middle School. No.1 Middle School was the best, and No.5 Middle School was the worst. In recent years, the situation was not optimistic. In order to make a comeback and surpass No. 3 and No. 4 High School, No. 5 High School urgently needed a good result! A guaranteed entry was simply icing on the cake! Gu Jijian's attitude towards Zhang Ruiyun immediately changed." Drink some water! Go get some water!" He had long forgotten about Zhao Kailong. Zhang Ruiyun took a sip of water, cleared her throat, and said seriously," Have you heard of Wei Minghai?” Gu Jijian's eyebrows instantly knitted together." Director Zhang, why are you mentioning this classmate at this time?!” Gu Jijian still had an impression of Wei Minghai! However, it was not a good impression! He still remembered how this guy had caused a computer virus in the information class when he watched videos in the past. In addition, he stayed out all night and fought… It could be said that he had a bad record. Zhang Ruiyun said," The good seedling I was talking about is him!” Gu Jijian's face darkened on the spot." Director Zhang! I don't have time to joke around with you!” Zhang Ruiyun emphasized," Principal! I'm telling the truth! Please believe me! Wei Minghai is really a genius!" "Look at this question on my phone. Xu Heng came up with it. He went up to answer it, and the time he used was similar to my former classmates, the math teachers, and even the professors in various major schools!” He showed the phone to Gu Jijian. Gu Jijian was already very patient! But when he saw that the question on his phone was a math question… What a scam! Gu Jijian almost flipped the table! "Get out! Get out!" Gu Jijian almost cursed. He pointed at the door and told Zhang Ruiyun to scram. "Principal! Headmaster! I'm not such a boring person! Please believe me!" Gu Jijian's face was ashen. Believe my ass! You want me to believe that a language teacher can set a math question for a student to solve, and then the student can solve it, and you want to say that he can be guaranteed entry? Bullshit! Do you think I'm a three-year-old child? Gu Jijian gave his ultimatum. His voice was thunderous." Get out!” "Principal! Principal!" Zhang Ruiyun left the principal's office dejectedly, unable to defend herself. "No, we have to think about this matter carefully. We have to discuss it with Teacher Xu Heng first!” Returning to Class 30! When Zhang Ruiyun was looking for Xu Heng, the blackboard was clean. All the students were either playing with their phones or sleeping. It was as if the math problem had never happened! " F * ck…What's going on?!" There are more updates later, 11 updates, 12 updates, etc. Please support me! This book comes from：m.funovel.com。