I didn't tell the teacher about the situation in the examination room, because I didn't want to make the teachers who were already worried even more worried.

Half an hour passed quickly, the end bell rang, and some candidates came out one after another, guarding the teachers to greet them and ask about the situation.

Shi Ning was squatting on the ground, holding a chalk and writing the question directly on the floor.

She squatted and wrote, and the teachers looked around, "Given △ABC.D is the ...... of the BC moving point" to write down the problem completely, and then draw the graphics, the teachers present are all math teachers, seeing the problems and graphics, they have pinched the sweat for their students.

This question is not ordinarily tricky, it's quite tricky!

The national selection has always been very cruel, the foundation is a little worse, and there is a certain gap with other candidates, and the four trials immediately see the high and low.

Shi Ning began to verify, "I initially entered the trap in the fourth step, and when I got stuck in the sixth step, I immediately reversed it and rechecked, only to find that I had a business ......trip in the fourth step."

"How much time did it take from the beginning of the verification process to the discovery of the error?" I don't know which school the teacher asked the question, so I was a little anxious.

"It should be about five minutes, that's the final question." Shi Ning replied, took the chalk and wrote the correct solution on the floor, and soon, ten 60 x 60 cm floor tiles were densely packed with formulas and numbers, and the results had not yet been verified.

This shows how difficult the question is!

Shi Ning found the mistake in the sixth step is very timely, if the middle part or the back, and then find the error, it is very likely to make the candidates' mentality tense, obviously know that it is wrong, but can not find the specific step wrong.

Shi Ning hadn't written out the answer yet, and the teachers nodded their heads here, yes, her verification steps were very correct.

Seeing this, Teacher Liu couldn't help but breathe a sigh of relief, yes, that's right, Shi Ning did everything right before, she was right about such a difficult question, and the other questions should be right.

"It seems that this year's questions are more difficult than in previous years."

"Alas, it's better to be difficult at all, I have lost a few times before, and I missed the gold medal, this time the question is difficult, it depends on the candidates themselves."

"I am afraid that many students will make mistakes in this big question, and it is easy to make mistakes in the fourth step, and it is easy to make mistakes in the sixth step...... In fact, it is difficult to find that something is wrong, and once you don't find it, it will all collapse. ”

Looking at the question that only half of the answers were written, the teachers did not ask Shi Ning to continue writing, they waited for their students to come and see if there was anything wrong in the front.

Teacher Yu brought all the candidates from Southern Province over, Lu Zhi'an and Xi Qinghuan walked together, and the two were communicating in a low voice.

High school candidates from other provinces were also communicating in low voices, and the most discussed questions were the last big questions.

"You go to see Shi Ning's verification in Anyang Middle School, she found an error in the sixth step of verification, and immediately went back to check, only to know that she made a mistake in the fourth step of the verification formula, you go and see if you have made the same mistake."

A teacher and three students hurriedly passed by Lu Zhi'an, Lu Zhi'an hurriedly raised his eyes to look ahead, and saw that there were teachers and students surrounded in front of him, as if he was looking at something.

The corners of Xi Qinghuan's mouth raised slightly, and then he pressed down again, and said lightly: "It seems that the three of us almost made the same mistake, but fortunately, we have done similar questions before and found the problem in time." ”

Similar questions, the three of them did it in Anyang Middle School, because of this, Lu Zhi'an and Xi Qinghuan both found their mistakes in time and corrected them immediately, otherwise, it is very likely that they will make mistakes this time.