Madam Han, Your Vest Has Fallen Off

Xia Dingwen snatched the book from the teacher next to him, flipped through a few pages, then took out a key from his body and opened the drawer excitedly.

Take out a very old and ripped book out of the drawer.

Although the cover has some feelings that cannot be dropped, it can be seen that it is the same as Chu Ning's.

Xia Dingwen compared Chu Ning's book with his own book, and after turning a few pages, he became more excited as he read it.

"It's really the first edition, and since the problem-solving process is clearer than mine, and the thinking is better than mine, this question is actually done this way. I thought about it for a long time and didn't understand it. There is this question..."

Xia Dingwen flipped through the book of Chu Ning, sighing, sighing and pleasantly surprised again and again.

Some teachers didn't understand why Teacher Xia was so excited because of a practice question, the teacher next to Xia Dingwen explained.

The National High School Mathematical Questions Collection is a collection of all major mathematics problems in the country. The mathematics questions in it are complicated and of various types.

Some mathematicians have spent their entire lives, and the problems they have made are only two-fifths of the problems in it. This is only after the third edition of the set of problems.

The previous editions were too difficult, so they have now been eliminated and reformed into a simple fifth edition. The first edition was published for the first time, and it was also the most difficult.

However, whether it is the first, second or third edition, it is now out of print.

Because this thing is too difficult, few people print it, and it becomes more and more rare over time.

So even if the fifth edition was released, it was not actually sold on the market.

This can also be seen, the degree of preciousness of this collective.

After the teacher explained, everyone looked at Chu Ning's eyes changed again, so Chu Ning did what she wanted and used exercises to bribe Teacher Xia?

As we all know, Teacher Xia is close to being crazy about the subject of mathematics. Sometimes he encounters a pleasurable problem. Even if he sits in the office for a day without eating and does not leave here, he has to solve the problem.

Xia Dingwen was still mumbling complimenting Gu Ange's problem-solving ideas in the exercise book, and suddenly, a small hand covered the content on it.

Xia Dingwen didn't even think about going to pick off the hand, but after picking it up several times, he didn't remove the hand, so he had to look at the owner of the hand reluctantly.

Only then did I remember who brought this booklet to Chu Ning, and her attitude towards Chu Ning was also a big turn. I won't say a word about you again."

Chu Ning nodded and said yes, so Xia Dingwen happily picked up the exercise book again, and didn't notice Chu Ning's expression.

Seeing that the writing was covered by the little hand just now, Xia Dingwen took a breath and wanted to teach Chu Ning, who was not sensible.

But because she brought this book, her tone is much better than before.

"Student Chu Ning, what else do you have?"

Chu Ning pointed to the exercise book she had given him: "There are two colors of handwriting on it. The blue one is written by me, and the red one was written by my mother before."

Xia Dingwen blinked, and it took a long time to digest the content, but he still didn't believe it: "What did you say?"

The handwriting on this is obviously that there are more blue fonts, and the red ones are some other problem-solving ideas.

But seeing Chu Ning nodding, Xia Dingwen felt even more incredible.