Chapter 8 three

The fifth period of our class today is mathematics.Onomichi-sensei is in charge of teaching, and Oreki-san and Fukube-san should already be familiar with it. I don't know where to start so that you can understand, so let's start from the beginning. During the fifth class, Mr. Onomichi walked into the classroom almost stepping on the bell.He doesn't seem to be in a good mood, but that's pretty much always been the case, as far as I can tell.Before opening the door to enter the classroom, Onomichi-sensei stopped for a moment and looked up at the class sign with the class number written on it. This is also a common and visible action.

After a hasty salute, Onomichi-sensei began to write on the blackboard.That's a quadratic equation.The formula itself is very simple, I think, it is y=x^2+x+1.However, the value range of x is limited within 0 to 3.After finishing writing, Mr. Onomichi tapped himself on the shoulder with the bamboo stick, and called Kawasaki-san to write the value range of y on the blackboard.Do you know Kawasaki-san?He is a tall, thin boy who stutters a little... these probably don't matter. Kawasaki-san was obviously confused.If anything, I'm actually confused too.We haven't learned about the domain-restricted case yet.

But on second thought, I think Onomichi-sensei might be testing our imagination.Before continuing the lecture, the teacher may want to see how we will evaluate the range.To be honest, I am not very good at this kind of thinking, but I have seen similar teaching methods.However, this method of letting students think for themselves does not match Mr. Onomichi's original teaching ideas. To Onomichi-sensei's question, Kawasaki-san thought for a while before answering no. Then, contrary to my expectations, Onomichi-sensei got angry.Why not?What did you listen to last class?Onomichi-sensei taught Kawasaki-san a few words... No, actually I don't want to use the latter word either, but rather than "educating", it might be more appropriate to say "rebuke".

If you continue like this, you will be in danger in the future—— After expressing this meaning with a slightly rough word, Onomichi-sensei asked Kawasaki-san to sit down. The next one to be named was Tamura-san, who was better at math than Kawasaki-san.However, even though Tamura-san stood up, she couldn't answer. Sit down, idiot—— Onomichi-sensei said to Tamura-san.Then, the teacher looked around the classroom and said: Can anyone make it? A little earlier might have been better, but it wasn't until then that I gradually realized that the problem might be on Onomichi-sensei's side.I opened the textbook and took a look. After learning how to find the coefficients of the quadratic function, today should be the first lesson of the unit of maximum value and minimum value.Onomichi-sensei made a mistake about the progress of one lesson.

The students seemed to have noticed this too, and there was a small commotion in the classroom.Seeing this, Onomichi-sensei seemed even more anxious.He started beating the blackboard with a bamboo stick, criticizing all of us for our lecture attitude, thirst for knowledge, and even public morality. I can't repeat the words and sentences.Later, he talked about our way out and future development after graduation, and the words were quite harsh.I thought about it, yes, every time he said a sentence, he would tap the blackboard hard. In fact, many people in the class also thought of a way to use images to evaluate the value range.Although I didn't go to cram school, I heard that the teaching progress of many cram schools for further studies is much faster than that of schools.But even those who knew the solution kept their heads down and did not raise their hands.

Onomichi-sensei called Tamura-san again, reminded him of the solution, and sat down after answering.That's when I stood up.I asked Mr. Onomichi if he made a mistake about the progress of the teaching, and asked him to double check. Ok?How exactly do you say it? ...Sorry, please keep this a secret.After all, his words and deeds when he was angry were not glorious deeds worth remembering. Yes, that's when I got angry.