On March 13th, the second Saturday of school, Limu ushered in the first selection of the Olympiad Mathematics after his wife's sweet and sweet love was in his pocket. The test center is located in the classroom of the school, which is divided into the first class of four years, the second class of four years, and the third class of four years.

The Olympiad is not a formal exam within the teaching system, and the exam time cannot conflict with the class time, which has always been arranged on Saturdays and Sundays, and is invigilated by a special teacher with a sealed test paper bag. For this purpose, the reference student will have to pay the material fee, proctoring fee, etc.

This kind of thing that requires money and brains is rarely done, so there are not many people in Pingnan Primary School who participate in the Olympiad. There were only three classes of 20 classes in the school, most of whom were third-graders who were newborn calves who were not afraid of tigers, and some of them were classmates who knew Limu.

They actively responded to Mr. Liu's call and chatted with laughter before the exam.

But after they have tasted the horror of the Olympiad and the frustration of the fiasco, I am afraid that they will never do such a thankless task again. Although the registration fee for the preliminary round is only 15 yuan, I participated in the Olympiad exam with great interest, but the results were not satisfactory, and the candidates who took the exam will also be very uncomfortable.

What's more, Saturday and Sunday are the most precious days for students, who can sleep lazily and play with their childhood sweethearts and girlfriends all day.

Turning his head to look at the tall figure outside the window, it was a big sheng man who volunteered to work overtime, and she usually worked on the construction site at this time without the concept of overtime. Now that she has a job at leisure, she is not comfortable with being free on Saturdays and weeks. She had no friends, only two younger sisters, and the idea of not wanting to study had already taken shape.

I was thinking about whether to ask her to carry two tables to exercise her arm strength.

There was a "bang" sound above the podium, and Riki reflexively turned his head, only to see a certain math teacher pressing the test paper with his hand, presumably to make the test taker come back to his senses by the impact sound generated when the test paper was released.

The clock hour and minute hands on the blackboard were pointing to the 9:50 position, and the invigilator took advantage of the students' attention to pick up chalk and brush down a few words on the blackboard.

[Exam time: 10:00-11:30]

"The exam lasts for an hour and a half, and you are not allowed to exchange your answers, and you have to hand in the test papers when you go to ......the toilet," he said.

Having said that, in fact, the invigilation of the preliminary round is not very strict, and the invigilator is the mathematics teacher of Pingnan Primary School who got this opportunity to "earn extra money". If cheating is discovered, it will only knock on the table at most, and it will not reach the point of arresting and registering. Unless the invigilator has a deep hatred for a student, or has reached the point where he or she can no longer tolerate it, he or she will be exempted from the exam.

After all, it is a national surname quality selection competition, and it is impossible for the organizer to have enough invigilators to be distributed to all parts of the country. In fact, there are not many teachers at all, most of them are managers, and they control this money-absorbing machine that will never lose money. The students are the customers, the invigilators hired are part-time workers, the teachers are designers, and the officials of the Education Bureau who have obtained the right to hold the test from the government are the ultimate beneficiaries.

If you have more reference people, you can make more money, and if you make money, you will send a little money to the top, not to mention opening up the road to a smooth career, but you can also keep your position; In order to "cultivate the interests of the flowers of the motherland in mathematical sciences", the state should support the development of the Olympiad mathematics, and only need to apply for subsidies in a state of making ends meet, but this will have an impact on the "political performance".

A spring breeze mixed with moisture blew in my face. The front and back doors were open, and there was an empty seat for the invigilator at the back of the classroom, who was trying to drive Da Shengnan out of the hallway.

The invigilator on the podium cut open the file bag, counted the test papers and scratch papers one by one, and handed them out.

There are a total of 12 questions in the Olympiad paper, and there are very few questions, all of which are fill-in-the-blank questions. When he opened the test paper and didn't finish browsing, Riki stopped, picked up the pen and wrote the answer to a question without hesitation.

[8. Reverse the order of a four-digit number to get a new four-digit number. If the new number is 7992 larger than the original number, then the largest number of all four-digit numbers that meet such conditions is the ________. 】

Are Primary School Math Olympiad Questions Difficult?

Riki finds it quite difficult, since he was a child, he has always passed the preliminaries but not the rematch, but even the preliminaries can give many adults a headache.

I remember an experiment in which adults did the Olympiad, and 61 social people were randomly selected to take the exam, 6 of whom were still middle school and university teachers, and none of them passed the final score, with an average score of only 28.80 points.

――Is it really difficult?

Limu also thinks that the method of doing the problem is wrong, and it is pure nonsense to find some people who have never done the Olympiad problems to do the experiment, these people have never done the Olympiad and have not practiced the Olympiad at all, and they don't know how to solve the Olympiad problems.

In fact, as long as you find the right method, you can easily guess the answer.

For example, in this question, as long as you see the keyword [four digits], you can guess that the answer is [1999], although there is no guarantee that the accuracy rate will reach 100%. At least 80% of the questions in this year's exam, and you can quickly reverse the answer and guess "1998" or "2000" if the answer is incorrect.

After all, this year is 1999, and the four-digit answer must have a lot to do with "1999".

Jingle Bell ...... The exam bell rings.

"Now you can start answering the questions."

By the time the invigilator said this, Riki had already completed two questions by leaps.

Anyway, it's not a serious foul, and the practice of writing questions in advance will not be confiscated even if it is placed in the college entrance examination, and it will be dangerous after being named and warned by the teacher, and only good children will really wait until the exam rings to start doing questions.

The opportunistic question was quickly written, and Limu returned to the first question on the first page [Calculation: (1+0.12+0.23)*(0.12+0.23+0.34)-(1+0.12+0.23+0.34)*(0.12+0.23)=________. 】

"The first question is always the easiest appetizer." Riki muttered.

The oral arithmetic answer is 0.34.

The above arithmetic formula is actually [1*(0.12+0.23+0.34)+(0.12+0.23)*(0.12+0.23+0.34)-(0.12+0.23)*(0.12+0.23+0.34)-1*(0.12+0.23)]

After eliminating the excess part, it is intuitive to see that the question is [(0.12+0.23+0.34)-(0.12+0.23)] = [0.34]

The difficulty of the question gradually began to increase from the first question, except for a little accident in the middle, in general, Riki still wrote very smoothly.

Question 11 Reasoning Questions [11. There are five questions in a mathematics competition (the full score is not 100 points), and Zhao Jun only did (1) (2) (3) (4) questions correctly, scoring 26 points; Qian Guang only got (1) (2) (3) (5) questions right, scoring 25 points; Sun Yue only got (1) (2) (4) (5) questions right, scoring 26 points; Li Tong only got (1) (3) (4) (5) questions right, scoring 27 points; Zhou Quan only got (2) (3) (4) (5) questions right, scoring 28 points; Wu Wei got all five questions right and scored ________ points. 】

Looking closely, Riki found that this question was particularly impressive, didn't he draw on scratch paper for most of the day when he was a child, and he didn't just get the answer until the end of the exam! What was the answer at the time? I can't remember, it's troublesome...... I have to push it again.

Final Answer【33】

-- In other words, take a look at the math competition in which Zhao Jun, Qian Guang, Sun Yue, and Li Tong participated......

"Xiao Ming's two goods don't seem to be able to play in the Olympiad......" Limu couldn't help but complain to Xiao Ming, who has a high appearance rate in various places, "Don't look at Xiao Ming's dirty, in fact, he is the most accomplished of all the children!" ”

A few classmates next to him frowned and shot their eyes over, which made Limu's back chill, and their eyes all had the meaning of "don't disturb our thinking". They were sad and thoughtful, obviously stumped on a certain question, and they didn't even find a breakthrough after thinking for a long time.

Have a hard time today?

Yes!

The fifth question is to look at the picture to find the shadow, and the pear wood almost can't play, and it takes 30 minutes to start solving the problem. However, Riki doesn't plan to prompt them to solve the problem, there will be a semi-final after the preliminaries, and it will be a shame if they can't write a single question at that time. In fact, after the Olympiad, the criticism of the bottom also comes from this.

Only 5% of students are suitable to participate in the Olympiad, and people call them "super-normal students". In fact, the more senior students participate in the competition, the closer to this ratio, the students who do not do well in the test have the self-knowledge not to participate in the competition, and most of the students in the lower grades are encouraged by the teacher to take a small test.

The problem with the Olympiad is that prestigious schools and private schools openly claim that they look at the Olympiad rankings of various disciplines as the hardware for admission, and some of them incorporate the Olympiad topics into the school test, so that the Olympiad training that originally belonged to a small number of people directly affects the fate of ordinary students.

Want to go to a prestigious school? Then apply for the Olympiad and read the training class!

The Olympiad is very difficult, and ordinary people can't afford it.

Training courses are expensive and cannot be afforded by ordinary people.

Of course, the crowd is excited, but as long as it is profitable, there will be people who will start and participate. This is the case with the rise of Aoying and Aowu, although it is not as good as the famous Olympiad, but it still makes parents rush to it and be happy.

There is a saying: Olympiad is a selection mechanism for rich people, to ban!

The training fee for a training course with a poor reputation is a few hundred yuan, and the training course for a better one is two or three thousand yuan. If I had the money to sign up for a poor training class, Riki might have been able to pass the semi-finals, and if I had reported a "top student training class" of tens of thousands of yuan, I guess I would have been able to go to the finals and win the prize.

In this way, although Riki is not a mathematical genius, he can brush down the real mathematical genius. If you just train, the first place may be difficult to step on, but the ninth and tenth ...... Even the hundredth place can still be stepped on. Occasionally, a guy would go up and step on it, and they would all have to slip down.

But just think about it, the ban on Olympiad is actually a fair channel for families who are generally powerless, powerless and moneyless. Civilians who can't read the training course can still pay more than a dozen yuan to study the materials, and the truly talented students will definitely not lose to the students of the training class, and the more difficult it is, the more they can hold back their perseverance.

The Olympiad can create opportunities for civilians to go to prestigious schools and get scholarships, but only 5% of supernormal students can get this opportunity. The middle class is also reluctant to spend thousands of dollars for their children to attend training courses, so public opinion is pointed at the rich students who can study training courses for tens of thousands of yuan, completely ignoring the interests of the 5% of gifted students.

In fact, the only thing that can fight between rich and poor students is academic performance!

At the beginning, many parents who cheered for the cancellation of the unified entrance examination for elementary school promotion, after discovering that after the cancellation of the unified examination, fighting for fathers prevailed, and fair educational opportunities were deprived! After the country canceled the Olympiad, "spelling dad or spelling Olympiad" also only left the word "spelling dad".

#高考农村户口独生子女能加分? Okay, Dad will find a way to change your account.

#少数民族户口还能加分? Okay, your grandmother is a Uyghur, and your father will immediately ask someone to transfer your household registration.

Because of the poor conditions of minority schools, a bonus point system is hereby set up for the college entrance examination. That being said, it just sounds like it makes sense...... But how embarrassing is this for the Han people in remote areas! If you consider that the study conditions are poor, why do first-tier cities still have to increase the admission score for second- and third-class areas?

- Nima, far away.

Thinking back to the time of Limu, in fact, it was a key university that barely went to by virtue of the "rural only child extra points", and it was the actual beneficiary of the bonus point policy.

…… However, his reading conditions are not much worse, and his high school is the fourth highest in the city, and the bonus treatment is a manifestation of his high evaluation. Many policies are not "pit dad" but "spell dad", and Limu was fighting for strength and luck at that time.

Thinking about a question for too long will inevitably get distracted, and by the time Riki finishes the last question, the exam time has already passed one hour and ten minutes, and the examination has taken another twenty minutes, and finally the test paper is handed in under the pressure of time.