Teacher Xu, Please Take Care of the Reckless Students in Your Class

"It's really weird! What's going on? Since these guys don't study, how can their grades be so good?"

If it was another class, whenever a classmate was playing with a mobile phone in class, Zhang Ruiyun would immediately show him to the public and confiscate his mobile phone!

But this is class 30!

And just now everyone in this class showed him what ability is.

"They are only in their second year of high school, and Teacher Zhao's questions are obviously beyond the outline, but they still got it!"

"Simply genius! Absolute genius!"

"They can become like this, definitely not because of Teacher Zhao, but only because of Xu Heng!"

"But he has only been here for a month, and he is a language teacher..."

Just when Zhang Ruiyun was in doubt.

Wei Minghai got up, "Mr. Xu, can I ask you a question?"

"It's the question that Teacher Zhao asked. If you only ask one question, it's really a waste of time. Do you think that question can be extended?"

Xu Heng raised his head, "?"

Wei Minghai smiled stupidly and immediately took the stage to write down Zhao Kailong's topic.

Zhang Ruiyun, "!!!"

Depend on!

When was Wei Minghai's memory so good?

As Wei Minghai wrote down the topic, all the students raised their heads.

"I think this question should have the value of being used again!"

"Yeah! Aside from Teacher Zhao, this question is a good one."

"Mr. Xu, can you give it a try? A second question?"

What a joke!

I heard right!

They even asked Xu Heng to ask the question in public!

Zhang Ruiyun smiled bitterly, "How do these guys know how difficult it is to quiz! This is a quiz!"

He was a math teacher and gave out the joint entrance examination questions.

Among them, he knows the difficulty!

Sometimes, for a question, more than a dozen teachers discuss together, and there is no result even after one day.

"Not to mention such a difficult topic!"

"This is a topic that Teacher Zhao has spent a month and is proud to come up with!"

Zhang Ruiyun was puzzled, "Besides, Xu Heng is a language teacher, are these students asking the wrong person?"

He felt that his three views were distorted.

"What the hell?"

But Xu Heng really turned his head to look at the math problem, then got up and picked up the chalk.

"Shhhhh..."

Let a and b be two real numbers, satisfying a<b, cut p1, p2∈(a,b), if f(a)=f(b), prove: f(x) on the interval [a,b] The sum of the lengths of monotonically increasing intervals is (ba)/2 (the length of a closed interval [m,n] is defined as nm).

So fast!

Such a serious question!

"This, this, this..."

Zhang Ruiyun didn't know how to describe what he saw today.

Shocked again and again!

And it hits people's three views more than once!

"It's not human, it's not human at all!"

"Even if Xu Heng wrote it indiscriminately! But no matter how you look at it, it looks very formal!"

"hiss……"

"Isn't he just a language teacher? When did he become so proficient in mathematics?"

"Could it be that he opened a remedial class outside the school? Specially for these students?"

"But it doesn't make sense! They are so bad! This is obvious to all. Even their parents say that their children do not learn well since childhood, and their grades count down from kindergarten!"

"It can be said that they have zero foundation since childhood! It is impossible to improve so much in such a short period of time!"

Zhang Ruiyun muttered, he was leaning against the rear window of class 30, his eyes staring straight in.

Wei Minghai and others immediately sat down to write and draw after seeing Xu Heng's second question.