Chapter 172

When the class bell rang, Gu Lu walked around the staircase classroom and just walked back to the podium.

At this time, a boy in a white coat and glasses rushed in.

"I'm sorry, I'm sorry, teacher, I was sorting out specimens in the lab, and I didn't notice that I was late. ”

The boy apologized to Gu Lu and said that he was about to go inside.

Suddenly, a unique smell filled the entire classroom.

That taste......

How to say it, it's fascinating.

The smell of rotten apples, ammonia, and stinky feet.

The three flavors are mixed together.

Gu Lu took a hard sip and almost died on the spot.

The other students in the classroom also covered their noses one by one, as if the eyes of the murderous version fell on the culprit boy in front of the classroom.

"What kind of smell does this smell on your body?" asked Gu Lu by covering his nose with his cuffs.

"Does it smell?" The boy was stunned for a moment, then raised his arm and sniffed, and explained to Gu Lu as if he was fine, "Oh, it should be the smell of ketones, and I accidentally spilled it on my clothes." ”

Ketones, a substance found in the urine of diabetic patients.

Gu Lu: "......"

Diaoping on clothes, is this classmate so calm?

Gu Lu waved his hand to the boy, "Hurry up and go back to the dormitory to change your clothes, I'll give you half a class leave." ”

"But I still want to go to class?" the boy looked reluctant.

Gu Lu had a black line, "Go!"

The smell of ketones is quite mellow, and there is still stamina, and the smell of stinky feet lingers on the tip of the nose for several days.

The boy continued to stay here, and it didn't take half a class, and it was estimated that the whole classroom would be sent to the hospital with gas poisoning.

Seeing the boy go away, Gu Lu immediately asked people to open the window for ventilation.

Then I took out my textbook and started teaching.

Gu Lu coughed lightly and began to speak, "Today we will bring the third section of the differential median theorem. ”

"In the last class, we got to know four mathematicians: Ross, Lagrange, Cauchy, and Lopida. ”

"After this period of time, I think you have developed a strong and inseparable emotion for these four mathematicians. ”

"Now, let me come up with a few questions to test your feelings about these four mathematicians. ”

Boom.

Gu Lu wrote four questions on the blackboard.

Then he showed a mouthful of white and neat teeth to the students in the audience, "Four questions, please use the knowledge of Ross's theorem, Lagrangian median theorem, Cauchy median theorem, and Lopida's law to solve." ”

"The time limit is fifteen minutes, and after fifteen minutes, the class leader will put away the students' answers and hand them to me. ”

"This is an in-class test, and the scores are counted in your usual grades, so take it seriously. Alright, the clock begins!"

As soon as Gu Lu's words fell, one wail after another sounded in the classroom.

Gu Lu's surprise test did not reveal the abundance in advance, so everyone in the medical school was caught off guard.

But they quickly adjusted, took a deep breath, glanced at the questions on the blackboard, and began to answer.

Fifteen minutes later, under the gaze of several pairs of resentful eyes, the class leader forcibly took away the unfinished answer sheet from their hands.

"Alas. A boy sighed with a lonely look after handing in the test papers, "I dreamed of Lagrange last night." ”

The roommate in the dormitory next to him immediately asked curiously, "Is it true that you are sincere in wanting to have a heart-to-heart interaction with the great sage mathematician Lagrange of the last century?" ”

"I don't know. I forgot the exact guilt, but at last Lagrange said five words to me with a smile on his face as he left, and I woke up at once. ”

"Which five words?"

The boy was speechless, his face expressionless, "You-high-number-hanging-!"

“……”

Seeing that except for the boy who would change clothes in the dormitory, the rest of the people's answer sheets were all collected, Gu Lu smiled with satisfaction.

Then turn around, erase the four questions on the blackboard, and write a big name in chalk - Brooke Taylor!

"Today I introduce you to another mathematician, Brooke Taylor, and his famous theorem, the Tiger formula!"

Many students in the audience couldn't help but look nervous.

Taylor's Formula!

Through the personal experience of the blood and tears of many seniors, it has been recited from generation to generation.

Let them know before they learn this part of the knowledge that Taylor's formula is the most difficult part to understand in the entire high mathematics volume, and there is no one!

There are four major generals under Gao Shu.

The fierce general Fermat, the fierce general Taylor, the fierce general Lagrange, and the tiger general Lobida, known as Malegbi.

Among them, Taylor, a fierce general, has the courage to fight against ten thousand.

Under his nirvana "Taylor Unfolding", many candidates cried bitterly and fled for their lives.

Even, many ordinary colleges and universities have excluded the Taylor formula from the exam syllabus.

What is avoided is that because of the Taylor formula, the rate of high mathematics failure has increased greatly.

It is indeed beneficial to the school to charge a retake fee for failing a high number of subjects.

But if the failure rate is too high, any university will not look good.

However, for top domestic universities such as Yan University, the Taylor formula is not only included in the syllabus of the high mathematics exam, but also listed as one of the key test points.

It's almost a must for every exam.

It is almost impossible to escape this catastrophe by luck.

So, no way, just listen carefully!

Almost all the students pricked up their ears and listened to Mr. Gu's speech on the podium.

"Before learning Taylor's formula, I will first talk about two theorems, which are Taylor's median theorem 1 and Taylor median theorem 2, Taylor's median theorem 1 is that if the function f(x) has n derivatives at x0, then there is a neighborhood of x0, and for any x in that neighborhood, there is f(x)=f(x0)+f'(x0)(x0)(x-x0)+......"

(The formula is too long, I'm too lazy to type, if you are interested, you can go to page 138 of the first volume of the high mathematics textbook.) ）

Gu Lu also knew that this was a difficult point, and explained it to the students in the audience little by little.

Although it was difficult, most people were still able to keep up with Gu Lu's rhythm.

In the back row, a classmate accidentally dropped his pen on the ground.

He lowered his head, picked up the pen, and continued to listen to Mr. Gu's lecture on the stage.

However, gradually, this classmate was confused.

Who am I, where am I, I'm in high math class, yes!

But I don't understand!

Did I miss some important information when I picked up the pen?

One second, I picked up a pen in high math class, and the next, I couldn't understand what was being said.

The classmate didn't know what was going on, and he didn't dare ask.

So, since then, when the class ended in high mathematics class, this student was completely in a state of confusion, and he couldn't understand what Gu Lu was talking about.

The so-called mistake for life, that's not all.