The lectures in the Iten High School are still the same and boring, and it seems that this is true in both China and Japan.

If it weren't for the fact that he had been quietly using the pure spirit stone energy in the high-grade spirit stones to strengthen the galaxy source power in his body, I am afraid that he would be bored to death in this class.

Liu Ling knew that the teachers in Philip's School were very boring and annoying when they were in class, but he didn't expect that after coming to Japan, these Japanese teachers who always said とにかく and また could talk about the class, and they could exceed the limits of human tolerance.

Even Liu Ling, who had amazing perseverance, was a little bored after listening to the first math class for a short while, and turned to practice the Galaxy Sword Technique to kill time, not to mention how tired those who listened attentively to the whole class were.

However, after Liu Ling's observation, all the people in this class did not have much impatience when listening to the teacher's lecture, but had a familiar expression, and there was no one who made small movements during the lecture.

At this point, most of the Chinese teenagers are inferior to the Japanese teenagers, so their performance also surprised Liu Ling slightly.

As a result, Liu Ling suddenly became interested in these Japanese students.

However, Liu Ling didn't know that while he was quietly practicing the Galaxy Sword Technique and observing the Japanese students, the math teacher on the podium had already discovered Liu Ling, a "distracted" obviously transfer student.

"Liu Ling's ......"

The math teacher, who had dense freckles on his nose, called Liu Ling out of jealousy of Liu Ling's appearance.

"I just finished explaining the original question type of this math problem to my classmates, now you can answer this example problem for you."

Instantly cut off the connection between the energy of the high-grade spirit stone and the galaxy source power in his body, Liu Ling, who was freed from the cultivation state, pushed away the chair, slowly stood up, looked up at the questions given by the math teacher on the blackboard, and was stunned for a moment, secretly wondering how this math problem in Japanese high school is so simple.

I saw that the example problem on the blackboard was titled "Known function f(x)=loga(a-ax)(a>1). (1) Find the definition domain and value range of the function; (2) discuss the monotonicity of f(x) within its defined domain; (3) Verify that the image of the function is symmetrical with respect to the straight line y=x. ”

"Hehehe, don't you know how to do it? Liu Ling. The math teacher glanced at Liu Ling, who was in a daze, a little happily, and said.

He felt that if Liu Ling, a newly transferred boy, was so handsome, popular with girls, and had good grades, it would be completely unreasonable!

Therefore, for the sake of the majority of ugly male compatriots, I must find trouble with this kid.

As soon as he thought of this, the math teacher continued: "So Liu Ling, you should listen carefully when you go to class in the future!" Don't get distracted in class like you did today......"

"Teacher, in fact, I will do this question."

Just as the math teacher was aggressively reprimanding Liu Ling and was about to continue the reprimand, Liu Ling's voice suddenly sounded weakly, interrupting his reprimand.

"Huh? Will you do it? ”

The math teacher's words were interrupted by Liu Ling, stunned for a moment, and then asked Liu Ling a little angrily: "Why didn't you say it earlier if you would do it?" ”

"Forget it, since you said you would do it"

The math teacher snorted, pointed to the chalk on the podium, and said, "I want to see if you really know this problem, come up, and write about the disintegration process of this problem on the podium." ”

"Okay."

Under the watchful eyes of the surrounding classmates, Liu Ling walked up to the podium without hurry, picked up a white chalk, and slowly left a line of neat handwriting on the blackboard: (1) Solution: obtained from a-ax>0, ax1,

∴x0 and a-ax>0

∴0＜a－ax＜a

∴loga(a-ax)∈(-∞,1), that is, the range of the function is (-∞,1).

(2) Solution: u=a-ax decreases on (-∞,1),

∴y=loga(a-ax) decrements on (-∞,1).

(3) Prov: Let f(x)=y, then y=loga(a-ax),

∴ay＝a－ax，

∴ax＝a－ay，∴x＝loga(a－ay)，

i.e. the inverse function is y=loga(a-ax),

∴ image of f(x)=loga(a-ax) is symmetrical with respect to the straight line y=x.

As Liu Ling's beautiful handwriting slowly appeared on the blackboard, all the students were stunned.

Even the math teacher looked at Liu Ling stunned with a surprised expression.

The steps and answers are perfect!

And every Arabic numeral, every punctuation mark is written beautifully! The answer on the blackboard is like a delicate artifact, and it is unbearable to destroy it.

"I haven't talked about this method yet, and it stands to reason that high school shouldn't be exposed to such complex calculations."

Although those students were surprised at the moment, they were not as strong as the surprise that Liu Ling brought to the math teacher.

It's just that before he could say anything, the bell rang regularly after class.

Then many boys and girls rushed to the podium with adoring eyes, surrounding Liu Ling in a circle, unaware that the unwilling math teacher had not left.

Because there are not many classes in high schools in Japan, there are only two or three classes in the afternoon, so when the two classes in the afternoon are finished, the time is just after 3 o'clock in the afternoon, and it is almost 4 o'clock.

As the bell rang for the end of the last class, Liu Ling's first day of school life in Japan was surrounded by the enthusiasm of his classmates.

After school, the students on duty stay to clean the classroom, and the other students can leave the classroom one after another.

Some students chose to go home directly, but many more stayed to participate in club activities.

Because the main reason why Liu Ling came to Japan was for the mysterious Holy Grail War, it was naturally impossible for him to waste his time on boring club activities.

After politely rejecting several invitations to join the club, Liu Ling walked out of the school gate with his long black backpack.

————————————————————————————————————————————

Because he just came to Japan yesterday, Liu Ling is still living in a hotel room with a lot of money, and he doesn't have any stable accommodation.

In this way, not only will the concealment not be guaranteed, but when the Holy Grail War begins, the other party can find out their whereabouts through the electronic devices in the hotel.

This is not what Liu Ling wants.

Therefore, it is imperative to rent or buy a stable residence.

Liu Ling, who returned to the hotel, thought so while using a Japanese one