City: My grandpa is super rich

My phone....

Seeing that his mobile phone was taken away like this, Fang Cong felt distressed and his heart was dripping blood.

You must know that this mobile phone was bought by him in installments, the total price is 10,000 yuan smaller, and his installments have only been repaid in two installments.

But now it was taken away by this little rabbit!

Shen Jianhai did not follow along to answer the answer, but when he saw the terrified expressions of several teachers, he already understood everything.

At the same time, there is a hint of happiness in my heart.

Lao Tzu has long said that this kid is a supernatural and can calculate calculus by heart, but you just don't believe it, and you take the initiative to provoke, isn't this asking for hardship?

Shen Jianhai coughed, attracting everyone's attention, and said, "I asked Xu Feng to help us solve the problem together, not to make you embarrassed!" "

Several teachers all bowed their heads.

Through what happened just now, they have completely believed that this kid in front of them is a mathematical master!

At the same time, I am glad that it was not myself who stood up just now, otherwise I would not have used my mobile phone now.

Shen Jianhai pushed out a mobile blackboard with a math problem about calculus.

"None of our teachers have come up with an answer to this math problem, Xu Feng, you come up and try it."

Xu Feng nodded, just as he was about to come up.

"Wait!"

Fang Cong suddenly shouted.

At this time, his voice was a little hoarse, and his eyes were bloodshot, as if he was a beast on the verge of anger!

He took off a ring on his ring finger, put it on the table, stared directly at Xu Feng, and said word by word, "Let's compare, if you can calculate this question in your heart, this ring is yours!" "

"It's worth a lot more than that phone!"

Several teachers were frightened and stupid.

"Teacher Fang, are you crazy? This is your wedding ring! "

"Think twice, Teacher Fang!"

"Teacher Fang, you need to calm down! Wedding rings are not for gambling! "

As if he hadn't heard it, Fang Cong just stared straight at Xu Feng, his eyes getting redder and redder!

As a teacher, he couldn't allow himself to be inferior to a student!

If this matter gets out, will his face rest there in the future?

And one of the main reasons why he made this bet was that he didn't believe that this kid could solve this problem by mental calculation!

He knew that even if he won the bet, his face would not come back, but at least he would not be so embarrassed.

Under everyone's gaze, Xu Feng nodded and said lightly, "In that case, okay." "

Then he stood in front of the blackboard, pinched his chin and pondered.

This time, he didn't give a direct answer.

Obviously, this question has some difficulties.

Otherwise, these teachers in the office would not have analyzed for half a day without analyzing a result.

Seeing that Xu Feng was slow to move, Fang Cong sneered and said, "If you can't solve it, just speak, don't delay everyone..."

Before he finished speaking, Xu Feng moved!

He took the pen and stepped forward and brushed a stroke.

1！

That's the answer.

Fang Conglan froze for a second, and then sneered, "Who knows if you randomly wrote a number to impersonate the answer?" "

Xu Feng said with a smile, "Don't worry, the next step is the closing process." "

Then he clapped his hands and said, "Teachers hurry up, take your own small bench and sit down, and then it's time to solve the problem." Because the problem solving process is more complicated, it takes a bit long. "

Several teachers were crying and laughing, but they still obediently moved their office chairs and sat down.

At this time, a very funny scene appeared in the office.

The teachers looked like elementary school students were listening carefully and taking notes, but Xu Feng, who was a student, stood on the stage.

Of course, there is another exception, that is, Fang Cong.

Fang Cong stood next to him, he wanted to see how this guy solved this problem.

Xu Feng moistened the run, then picked up the board and patted it heavily, saying, "Class!" "

Not to mention, at this time, Xu Feng really had a bit of charm of a bald math teacher who had been teaching for many years and had been tired of his students.

A female teacher cried and laughed, "Xu Feng, we have been engaged in so many forms, let's solve the problem quickly." "

"Okay."

Xu Feng put away his mind of playing and became serious.

"In fact, the most powerful thing about this problem is that everywhere you are tempted to solve this problem with a wrong mathematical law, so this causes many people to be wrong in the first place."

"But if you remove all kinds of useless words and data, the situation will be clear."

"The first is here, using the typical Lopida's law, dismantling and bringing it into the original form. It should be noted that this part should be regarded as a whole, and then solved and brought in..."

Ten minutes later, the solution process was written all over the blackboard.

The teachers all had a sudden and cheerful feeling, and they had a lot of insights in their hearts, and they were even more amazed by Xu Feng!

Such an ingenious problem-solving idea, they are afraid that they will never think of it in this life!

Xu Feng dropped the pen in his hand and said, "The problem-solving process is here, this is the simplest of the seven methods of solving the problem." "