Sichuan Online - Huaxi metropolis newspaper

question

a math problem, and how do you do the answer to the standard answers given in the book? Most of the students chose to correct, but Luo Yi, a 9 year old boy in West Core Primary School of Chengdu hi tech Zone, overturned the so-called correct answer by linking up with the reality of life. In the process of seeking evidence, parents found that this question not only took the high students of mathematics in universities such as the electronics department and Tongji University, but also appeared as the two Olympic test question. The wrong answer was undetected by the publishing house for 5 years.

contact the actual life learning knowledge 5 times communication press to correct the answer

"150 bright lights, each have a wire switch control, the sequence number is 1, 2, 3, 4,... 150. Pull the pull wire of the lamp numbered 3, and then pull the tension cord numbered 5. After that, how many lights are there? This is a thinking math problem for the public factor and the common multiple. This summer, I met this problem when ROI, three, in the math contest of grade four, met this problem, and calculated that the answer "90" was not consistent with the standard answer "80", and mother Chen Qun was only the wrong son.

"Mom, I'm not wrong!" Roy had never seen a pull lamp, but he guessed that it should be like a fan in a restaurant, pull it up, pull it up and stop. "Therefore, the ten lights that overlap 3 and 5 times have been raised two times and lit up. The final answer should be added 10 on the basis of 80."

Roy's father was a high student at Tongji University. The first time he used the common factor and the common multiple method to calculate the 80. After listening to Luo Yi's explanation, it was suddenly realized and added 10. What is surprising is that Chen Qun surfing the Internet to find out that this problem is an Olympic "title", which appeared in the 2011 and 2013 Olympiad tests, and the answer on the Internet is 80, which makes Chen Qun realize the seriousness of the problem - it is necessary to contact the authority to correct the error. At the beginning of

, the answer of a 9 year old child did not arouse the attention of the youth world Olympic Organizing Committee. "When I heard that the children did not participate in Olympiad competition, they questioned the answer. The organizing committee even said it was not entitled to correct it, so that we could go to the publishing house." In September 28th, Chen Qun had to contact the Chongwen book publishing house, "Pei Xin's helper". The press saw that in the 3 mail and 4 telephone communication process, the Publishing House asked the editor and many editor to do the problem again, and thought that "this problem has the problem of solving the problem, it belongs to the wrong idea", still persisted in the old answer, and suggested that the child go online to search the problem solving steps. Chen Qun was not reconciled. She sent out two error correction messages, telling Roy's ideas and common sense questions to the editor. At last, in the morning of October 20th, Chen Qun received the mail of Xu Juxin, director of the editorial office of the Chongwen Bureau of books. "We feed back the ideas and answers of the children to the editor and the editor. After reexamining the problem, we are surprised to find that the children's ideas and answers are really correct." The editorial department promised to make a statement in the relevant authoritative magazines and use Roy's answer in the future publication. Xu made an analysis of the cause of no correction for 5 years. "Adults will use the common multiple when solving this problem. But this question is very difficult for children, and their answers usually come from teachers, parents and standard answers.

love summing up the laws of mathematics to apply the principles of science to

from grade three. At the time of the two digit number of knowledge points, other children with the vertical or one by one, but Roy painted several cross lines in the draft, to the location of the intersection to give the answer. "He told me that this method was invented by a mathematician. On this basis, he simplifies the lines, and a few strokes can directly see the answer, more convenient and faster."

finish the question in the book. Roy often clamours for his parents to give him a question. Chen Qun once brought a question that needed to be used in the mirror principle of high school to Luo, but he did not think that he would get the right answer in less than a minute. Luo Yi disagrees. "I have long summed up that when the length and width are constant, the length and width of the rectangle tend to be closer to the square, and the larger the area is." As a representative of mathematics class, he is not only a teacher's little assistant, but also often answers questions for his classmates, and also makes them leak each other.