But after listening to the middle-aged man's words, Lin Weiwei ...... How can I say it, I'm a little speechless, this group of bear children can make the math teacher so angry that he is hospitalized? There's no one left....

And after listening to Zhang Xin's words, except for Lin Weiwei, all the students were shocked and asked Zhang Xin to be their math teacher? If they don't behave well in class, how many layers of skin does this guy have to pick off them?

"I also know what is the situation in our thirty-second class, I don't care if I don't meet other classes, but in my class, if you dare to violate classroom discipline? Hehe, the first time I wrote a 3,000-word review, the second time I invited parents, and the third time I was a straight jerk! Okay, that's good news, right? Shouldn't you be glad that one of my deans is your math teacher? Zhang Xin said with a smile, still hiding a knife in his smile!

The classmates at the bottom scolded in their hearts, it's a good thing that you came to teach us mathematics? Are you sure you're not kidding? It's really been eight lifetimes of blood mold before I put you to be our math teacher!

......

Zhang Xin started to lecture, I have to say, Zhang Xin's teaching is still very standard, these students don't care whether they understand or not, they are listening carefully anyway, and they don't even sleep! Only Lin Weiwei was thinking there, she was thinking about calculus.

"Some students think that they are superior to others if they become a fifth-tier star, and they don't need to listen carefully in class!" While lecturing, Zhang Xin suddenly stopped and said in a strange manner.

Everyone was stunned for a moment, and they all looked at Lin Weiwei, a fifth-tier star? There is only one Lin Weiwei in the class!

Lin Weiwei was also stunned, she didn't expect this new teacher to lead the topic to her, could this be the legendary new official who took office with three fires, and first found someone to get off the horse?

Zhang Xin said: "Lin Weiwei, please answer this question, if you answer correctly, I am not guilty of your distraction in class, if you make a mistake, give me some 3,000 words of review, read it out in front of the whole class!" ”

As he spoke, Zhang Xin pointed to the question on the blackboard

The other students whispered

"This question, I've been listening carefully since class, but I didn't understand it, Lin Weiwei is still distracted, how can it be?"

"It's just, and the logarithmic problem is too difficult, right? Even if we are asked to do it first in math, I'm afraid we won't be able to do it! ”

"Uh.... In the high school entrance examination, Lin Weiwei seems to be the first in mathematics in our class! ”

"Cut, the hero doesn't mention the courage of the year, Lin Weiwei hasn't learned anything in the past two months when she participated in the super newcomer!"

"How do you know that people haven't learned anything? Maybe they're at home, right? ”

.........

Lin Weiwei walked onto the podium embarrassedly, but she was also a little angry, and the teacher's tone was ...... How do you look down on them for singing? At the same time, I looked at this question:

Known: log182=a, trial a means log32.

Logarithms, huh? Lin Weiwei thinks that she has learned the mathematics textbook of compulsory one in her previous life quite well, and she instantly calculates the solution to this problem in her mind. It's too easy, right?

Lin Weiwei got to the blackboard and began to write

log182=log32/log318=..........=2a/1-a

In Lin Weiwei's memory, such a problem should be solved by using the logarithmic formula to solve it, and it was easy to solve.

Zhang Xin looked at Lin Weiwei's answer, hey, it's right? Then he looked at Lin Weiwei's steps again, and his brows furrowed

"Lin Weiwei, why did you change the logarithmic low?" Zhang Xin asked.

Lin Weiwei was stunned for a moment, and then remembered one thing, this world doesn't seem to be ..... Bottom change formula?

Lin Weiwei organized the language and said: "Teacher, this is a simple algorithm that I summarized based on this kind of problem, I found that this kind of problem can be solved quickly and accurately with this kind of problem, I summarized this method into a formula, I call it the formula for changing the bottom!" ”

As she spoke, Lin Weiwei wrote down the formula for changing the bottom on the blackboard!

log(a)(b)=log(c)(b)/log(c)(a)

Zhang Xin's brows furrowed even deeper, a simple algorithm that he researched? Or the bottom formula?

He looked at Lin Weiwei's so-called formula for changing the bottom and felt ...... It's a little unreliable: "You still don't use this simple algorithm indiscriminately, please use the method I just taught to solve this problem!" I can tell you that your answer is right! ”

Zhang Xin's words made Lin Weiwei a little embarrassed, use your method to solve this problem? How would I? And there is a simple algorithm, why do you still use such a troublesome method? And it takes a lot of steps, and it is estimated that it will take a long time just to write the steps, if there is such a question in the college entrance examination, isn't this a delay in everyone's time?

After thinking about it, Lin Weiwei said: "Teacher, my simple algorithm is well-founded, and my formula for changing the bottom is also pushed out step by step!" ”

"Pushed out step by step? Then will you give everyone a push on the spot? Zhang Xin wanted to see what tricks Lin Weiwei could play, he Zhang Xin has been teaching for more than 40 years, and he has been studying mathematics for more than 50 years, and he has never found that the problem of logarithms can be solved like this!

Lin Weiwei calculated the formula for changing the bottom on the blackboard! If there is logarithm log(a)(b), let a=n^x,b=n^y(n& gt; 0, and n is not 1) e.g., log(10)(5)=log(5)(5)/log(5)........

Lin Weiwei's derivation was well-organized and easy to understand, and Zhang Xin's eyes were getting wider and wider...... This...... How is this possible? Was it really pushed out by this guy?

From the perspective of Lin Weiwei's formula, this kind of logarithmic problem ..... Can it really be solved this way?

Zhang Xin found a question on his teaching case and gave it to Lin Weiwei: "According to your method, do this question!" ”

Lin Weiwei looked at the question, and wrote it on the blackboard, and the sound of brushing scratched Zhang Xin's heart, if this bottom-changing formula is proven, then this is definitely a great contribution to the history of mathematics!

If Lin Weiwei knew that Zhang Xin wrote ideas, she would definitely despise him fiercely, and he would also make a great contribution to the history of mathematics? In this case, the baby will take out all the formulas in his head, and this will not be the greatest mathematician in the world?