Good luck! This village is full of billionaires

Xu Bin is a teacher at Rainbow Island High School.

Two years ago, he was attracted by the benefits of Rainbow Island High School and came to teach at the school.

After coming to Rainbow Island High School.

Xu Bin was very satisfied.

The hardware condition of the school is very good, and the campus construction is very beautiful.

The work desks are custom-made and come with comfortable lounge beds.

The home of the teaching staff has books, tea and coffee, literature and art and petty bourgeoisie.

The well-decorated apartments provided by the school to the faculty and staff are equipped with all kinds of household appliances, which solves their worries.

There is a subway station next to the school, which is extremely convenient to travel.

The only fly in the ointment that Xu Bin felt was that the students at Rainbow Island High School were "poor".

Poor refers not to the atmosphere and character of the students.

Rather, the students are mainly from the children of the faculty and staff of Rainbow Hospital, the children of the faculty and staff of Rainbow University, and the children of buyers of Rainbow Island.

Their foundation is not as good as that of "Rainbow Village Students".

Of course, the students who have household registration in Rainbow Village are basically studying at Rainbow High School.

Rainbow High School, which topped Xia Guo High School last year, is shining brightly.

and Rainbow Island High School, which also belongs to Rainbow Village.

But he was unknown, and he didn't even enter the TOP500 of Xia Guo High School.

All grade students.

There are only a handful of seedlings in Huaqingyan.

If you're lucky.

A small number of students can be admitted to 985 universities or 211 universities.

No way.

Compared to Rainbow High School.

Rainbow Island High School recruits a relatively average number of students.

What Xu Bin can do is to let as many students as possible be admitted to university!

......

March 2.

As usual, Xu Bin walked into the class of the third (2) class of high school and gave a math lesson to the students.

He took out his textbook and said, "Before class, I'll test your learning results during this winter vacation." "

The voice fell.

Xu Bin picked up the chalk and brushed the topic on the blackboard.

Most of the curriculum at Rainbow Island High School uses multimedia instruction.

However, math courses still use traditional blackboards.

He came up with two questions.

First, it is known that f(x)e?-ax has the same minimum value as g(x) equals ax- x.

1. Find the value of a.

2. Prove that there is a straight line y b, which shares three different intersection points with the two curves y f(x) and y g(x), and that the abscissa of the three intersections from left to right is in an equal difference series.

Second, the height of the regular triangular platform is 1, and the upper and lower bottom edges are 3 3.4 4 respectively, then the surface area of the outside ball is ().

A 100。

B，128。

C，144。

D，192。

Answer the questions and draw the formula.

......

Xu Bin looked at everyone in the audience and asked, "The first question, who is coming?"

Brush Brush Brush!

The students all raised their hands and wanted to answer the questions.

"Teacher, I can do this question!"

"Teacher Xu, choose me, choose me!"

"Let me answer the question, please!"

Seeing this, Xu Bin smiled.

He ordered a random female student, handed her the chalk, and motioned for answering.

Xu Bin asked again: "The second question, who is coming?"

The students raised their hands at the same time.

He randomly ordered a male student and came up to the stage to answer the question.

In key high schools.

These two questions are both difficult questions.

In a regular high school, there are even fewer answers.

Xu Bin didn't have expectations.

Who would have thought, the students all raised their hands.

This surprised him.

Xu Bin looked at the blackboard to see if the students were indiscriminate.

I saw the first female student on stage, and her thinking was very clear.

She writes: "A 1, f(x)e?-x, g(x)x-x.

From (1), we know that f(x) and g(x) have one intersection point, then there must be three different intersection points between a straight line y b and two curves y f(x) and y g(x).

Consider the abscissa of these three intersections to be x1, x2, x3.

Note that e x x has x1 x2 and x2 x3 in the same way, i.e. e3 is equal to e?2.

So x1+x3 x2+e?2, and 2x2 x+2e?2, so x1+x3 2x2, that is!

See the answer to the question.

Xu Bin nodded with satisfaction.

He turned his head to look at the second boy who was answering.

I saw the male student draw a figure on the blackboard and set A . A1、B、B1、O、O1、O2、C1、P。

AB is equal to 4 3 O2A 4 and AlB1 3 3 OlA1 3.

Set the radius of the outside ball of the triangular platform to R.

OO2x, high OlO21.

At RT? In OAO2, OA2 O2A2+OO22 R2 16+x2......

Write down the formula line by line.

Male student asks for 4 R2 100!

The student finishes writing the final formula and puts the chalk head down.

He patted the chalk foam on his hand and sat back in his seat with a nonchalant expression. (If you read a violent novel, go to Feilu Novel Network!)

......

Two questions down.

Xu Bin nodded with satisfaction.

The two students answered correctly and did not miss any mistakes.

He couldn't help but ask, "Students, how did you do it?

The voice fell.

The representative of the mathematics class stood up and explained: "Teacher Xu, the college entrance examination is getting closer and closer.

During this year's winter vacation, we have been reviewing our homework, and our grades have improved rapidly.

After the start of the new semester.

We found that your math lessons are very subtle, easy to understand, good at giving examples, and in-depth and simple.

After listening to the class, everyone felt that they had benefited a lot.

The types of questions that we didn't master before suddenly had the right idea to solve them.

Growing up, we felt that math was so easy for the first time!"

Hear this.

The students present nodded their heads and seconded the proposal.

Seeing this, Xu Bin was stunned and blushed a little.

In his more than ten years of teaching career, he has never received such a high evaluation.

Xu Bin took a deep breath and said in a condensed voice: "Students, mathematics is a very important subject.

The universe is big, the particles are small, the speed of rockets, the ingenuity of chemical industry, the changes of the earth, the mysteries of biology, the complexity of daily use, and mathematics is everywhere.

The aerospace field, the national defense and security field, the biomedical field, the information field, the energy field, the marine field, the artificial intelligence field, etc., are all inseparable from mathematics.

In the Xia Kingdom, mathematics is the mother of science.

The teacher sincerely hopes that you can learn mathematics well.

Whether it is the college entrance examination in a few months, or in your future life, you will deal with mathematics. "

The voice fell.

All the students in the class nodded solemnly.

During this year's winter break.

Each of them was surprised to find that their learning ability was many times stronger.

Mathematics, Physics and Chemistry in Science.

History and Geography of Liberal Arts.

It seems that all disciplines have opened a new door for them.

It's very easy to learn.

The students didn't know why this was happening, they just thought it was a lot of accumulation.

Since that time.

They work harder to learn and make rapid progress every day.

After serious efforts.

The students suddenly realized how good their teachers were in each of their courses.

The teachers of Rainbow Island High School are all famous teachers hired with high salaries.

They give lectures, and they are already at a very high level.

One comes and goes.

All the students of Rainbow Island High School seem to be "reborn".

......

Next.

Xu Bin officially gave a math lesson to the students.

He found that every student was attentively listening to the lecture and immersed in the world of mathematics.

Xu Bin likes this class atmosphere very much.

He could see that there were no students in the class who were distracted.

Because in everyone's eyes (Chano's) there is a thirst for knowledge.

......

At the same time.

All the teachers at Rainbow Island High School, Rainbow Island Junior High School, Rainbow Island Elementary School, and other schools have felt the change in their students.

Students learn quickly and seriously.

The teachers naturally teach seriously.

The combination of the two creates an unparalleled classroom atmosphere.

Actually, what they don't know is.

All schools in Rainbow Village have the blessing of "doubling the aura of village learning ability" and "doubling the halo of teaching by famous teachers in the village".

Blessed by an aura.

Every student's learning ability is much stronger than before.

Those difficult and difficult knowledge points can be learned by students as soon as they are learned, and they can even draw inferences from each other.

The same is true for teachers.

Preaching, teaching, and solving doubts have the role of sorting out one's own knowledge and improving one's professional level.

While they are teaching, their skills are also improving rapidly.

Under the combination of the two.

All schools in Rainbow Village have the best quality classroom education in the world.

Quietly, the students are progressing at an astonishing rate.

Over time.

The foundation of students will change from weak to solid, to strong, and even everyone can become a student at the top level!