On Saturday, August 11, at 9 a.m., in a large classroom at Lingshui County No. 5 Middle School, there were 94 students, some of them writing hard, some of them thinking blankly, and a young man on the podium was sitting there recording something.

The young man on the podium is Xiao Ran, today Saturday, Xiao Ran is training students for Olympiad mathematics, and at this time he is doing a talent training test.

After about 30 minutes, Xiao Ran raised his head and said, "Okay, in the next half an hour, I will explain the logical reasoning questions in your hands, you should pay attention to the lecture." ”

"After the first round, it is stated that any two numbers are different. In the second round, the first two people did not guess, indicating that no number is twice as many as the others. Now there are the following conditions: 1. Each number is greater than 02. Two and two are not equal, 3. Any one number is not twice as many as the others. Each number may be the sum or difference of the other two, and if a third person can guess 144, one of them must be ruled out according to the first three conditions. Hypothesis: is the difference between two numbers, i.e. x-y=144. At this time, 1(x,y>0) and 2(x!=y) are satisfied, so to negate x+y, it is necessary to make 3 unsatisfied, that is, x+y=2y, and the solution is x=y, which is not true (otherwise it can be guessed in the first round), so it is not the difference between the two numbers. Hence is the sum of the two numbers, i.e., x+y=144. In the same way, if 1 and 2 are satisfied, 3 must be unsatisfied, that is, x-y=2y, and the two equations are combined, so that x=108 and y=36 can be obtained. ”

Let's take a look at the guessing process of the three students. ”

......

Under Xiao Ran's own concentration and ethereal buff, the students understood very quickly, and after half an hour, Xiao Ran sent the answer to all the students and asked them to figure it out for themselves.

Originally, Xiao Ran was going to start talking about the Olympiad knowledge next, but seeing that the students below were still frowning and pondering, and some suddenly realized, it seemed that Xiao Ran was not very accurate about the time of logical reasoning, and he gave a bit too many test questions.

Next, in the morning, Xiao Ran talked about the knowledge points and example problems of the Olympiad, and in the afternoon, he gave questions to the students to practice.

After a day of special training, Xiao Ran found that many students were inspired by the special training, not only to improve their mathematical talents, but also to improve their other talents.

The learning of each subject is not independent, and has some influence on other subjects to a greater or lesser extent, and students are inspired by logical reasoning, not only in mathematics, but also in their thinking. Therefore, it is understandable that the talent of other disciplines has been slightly improved.

Subject talent is the main factor affecting students' learning efficiency, for example, a student with low talent may need to study a knowledge point many times repeatedly to understand it thoroughly, while a student with high talent may be able to fully understand a knowledge point at one time, so he will have more time to study.

Students with high talent are not only easier to learn, but also have a very high time utilization rate, and can often achieve twice the result with half the effort.

In fact, Xiao Ran's focus and ethereal buff greatly made up for the talent gap.

Students in a state of concentration and ethereal are equivalent to being in the state of epiphany mentioned in the novel, with a pure mind and a single purpose, and they are fully engaged in learning, and they will naturally be able to understand what they have learned very quickly.

......

The time came to 7 o'clock in the evening, and Xiao Ran received a call from Zhao Feifei.

"Ranran, why haven't you contacted me recently?" Zhao Feifei asked resentfully.

"Gee, I didn't just start teaching, I was so addicted to it that I didn't pay attention to the passage of time and forgot to call you. Xiao Ran said apologetically.

"Just the 10th class you taught, the worst class in the whole grade?" Zhao Feifei said.

Xiao Ran took over a class teacher as soon as he joined the company, Zhao Feifei knew it, but this class was too bad, how good could the class composed of the bottom students of the whole grade be?

"No matter how bad they are, but I will not give up on any student, and they just have poor academic performance, in fact, they are not stupid, but very smart, as long as they focus on their studies, they are not afraid that their grades will not improve. Xiao Ran said with a smile.

"Oh, then you have a result?" Zhao Feifei said curiously.

"Of course, haha, I've been reviewing high school math with them for half a month, and their foundation is too poor, so I want to take some time to review it first and lay a foundation for them first, otherwise it won't be very ideal if I rush to a new course. ”

"I just finished reviewing last Wednesday, and then I did a phased test, and the test questions were based on the difficulty of the college entrance examination.

"What's the matter, someone has taken the zero egg?" Zhao Feifei grinned.

"Hehe, there is no one in the class below 100 points, an average score of 131 points, and more than a dozen points above 140 points, how about it, is it bull or not?" Xiao Ran said in a huff, no one revealed his test results this time, as for Huang Qiang, he didn't ask Xiao Ran.

"You, you didn't lie to me?" Zhao Feifei's eyes widened, her phone almost fell to the ground, she was shocked for a while and then asked in disbelief.

"Don't you know who I am? Xiao Ran replied with confidence.

"Haha, of course, you can, don't talk about the middle school in the county with this kind of grade, even Yucai doesn't have a class that can get this kind of grade, you are... How did you do that?" Zhao Feifei was very excited, Xiao Ran had achieved such an achievement in only half a month, and Zhao Feifei was very happy for Xiao Ran.

"Actually, I didn't do much, I just did their ideological work, told them the importance of learning, and then there was a normal lecture, maybe I was born to be a teacher, I didn't expect them to progress so fast, I was also taken aback. Xiao Ran naturally wouldn't tell Zhao Feifei that he had a teacher system, so he could only say vaguely.

"Then come out and celebrate, old place, see you or leave. Zhao Feifei said happily.

"Okay, I just brought a friend with me. Xiao Ran agreed.

"Bang bang!!"

Xiao Ran knocked on Huang Qiang's door, Huang Qiang opened the door and asked, "What's the matter?"

"What are you doing in your room all day? Xiao Ran said with a smile.

"Where are you going?" asked Huang Qiang suspiciously.

"Less nonsense, hurry. ”

After Xiao Ran and Huang Qiang fought side by side, the relationship between the two was much better, although Huang Qiang was still silent, but when Xiao Ran chatted with him, he did not refuse.