She obviously heard Zhao Dongming say that Li Xuan was the number one in the province in the Chaoyang Cup mathematics competition.

Li Xuan typed politely: "Hello coach."

"Just call me Sister Rui. I heard you want me to see if Peng Saile's proof is wrong. It's good. I know Peng Saile's theorem. Send your proof to see."

"Coach, wait a minute, I'll take the certificate and send it to you." Li Xuan slowly sent the photo.

After a while, Lin Xuerui finished reading and sent a message:

"Li Xuan, your three proofs are all correct, but the steps are too jumpy."

"Peng Sailie's closing theorem, the graphics are very beautiful. In fact, a few years ago, when I was a high school student, I participated in the Southeast China Mathematics Competition. I encountered the simple situation of Peng Sailie's closing, and I was fascinated by this wonderful graphics... Later, in the National GT team, a classmate from the National GT team told me the method of algebraic proof, just like yours."

"I won't talk about the analytical geometric proof method. The calculation is very large and it will make people vomit blood, but it can definitely be calculated. This kind of proof is too ugly... I have never seen a method of geometric proof. The geometric proof method you gave is very special, the idea is very clever, the process is the simplest, and maybe it can be published in the "Mathematics Bulletin"."

Li Xuan was really convinced after seeing her reply.

From yesterday to today, it took him a day to make a proof. The coach understood the proof process after a while. He was really talented and real.

Li Xuan was a little curious, "Coach, I heard that you made four CMO league problems on the spot in front of the principal?"

CMO League difficult questions, Li Xuan is okay to do geometry questions now, but he will stop doing other algebraic number theory combination questions.

When the coach saw the finale of CMO, he picked up the brush and made it when the principal picked up the brush. Li Xuan thought the new coach was too awesome and was not on the same plane as him.

After a while, she replied, "Oh, that thing... Actually, it's because I've seen the questions before. I'm applying for a math Olympiad coach, why don't I prepare? I must first look at the questions in the CMO League in recent years. I didn't expect that your principal took the CMO finale test for me. When I encountered the original questions, of course I did it casually. Seeing your principal's shocked eyes, it was very funny. Why are your principals so stupid? In order to be afraid of being too scary, I dare not do all five questions."
Chapter completed!