A. B, C and d have repaired a chair in the classroom The teacher asked, "who repaired it?" A first said, "I didn't fix it anyway, B said, "maybe it was C." C said, "no, it's D." D says "C says false" Only one of them told a lie. Who repaired the chair

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• 1. Infer the unknown number from other numbers a.0,6,24,60,120, b.12,23,35,48,62, c.1,2,9,,625 d.1,1,2,6,,120 e.0,3/25,1/2,3/5,6,
• 2. This man is not kind and lovely If the above is true, which of the following must be true A if this person is kind, then he must not be lovely. B if this person is not kind, then he must be lovely C is kind, but not lovely. D is lovely, but not kind. E is neither kind nor lovely The correct answer is a What I think is, the above proposition = this person is either kind or lovely So choose ab. but why is the answer a? What's wrong with B? I hope you can give us a more detailed reasoning process
• 3. Asking for help on some questions of logical reasoning If the following reasoning is valid, write the form if it is valid, and if it is invalid, explain the error Some people are not young people, so some young people are not people 2. Platypus is oviparous, platypus is Brucella, so all Brucella are oviparous 3. All laws are compulsory, so all compulsory laws are laws 4. This is syllogism, the third case, this syllogism is AAI type, this syllogism is AAI type of the third case 5. The offender is guilty of theft or robbery, and the offender is guilty of theft. Therefore, the offender is not guilty of robbery 6. If it's too hot, it's uncomfortable. If it's too cold, it's uncomfortable. It's either too hot or too cold. In a word, it's uncomfortable 7. Only by changing the price system can we enhance the vitality of enterprises
• 4. Find the answer to the logical reasoning problem about Apple Ten baskets of apples and one basket of inferior products 10 liang of genuine products and 9 liang of defective products Weigh once to find the defective product
• 5. A logical reasoning problem, In the past five years, five w-160 passenger planes have been crashed. In the face of the accusation that the w-160 design was wrong, the w-160's life is not good The manufacturer explicitly denied it on the ground that every investigation into the w-160 air crash showed that the cause of the crash was flying The operator made a mistake Which of the following must be assumed in order to make the above refutation of the manufacturer Tenable? A if the pilot doesn't make mistakes, the w-160 won't crash B the pilot's misoperation has nothing to do with the design of any part of the w-160 C the conclusion of every investigation on w-160 air crash is credible The answer is to choose B and C. why not choose a? Please analyze in detail,
• 6. Find the answer to this logical problem 8) The issue of money Now, on the table in front of you, there are 100 coins that face the sky is "Gong", and other coins that don't know the quantity and face the sky is "Hua". Then your eyes are covered. (you can't remember the location of all the coins.) now you try to divide these coins into two parts, So that each coin has the same number of "male" coins (the number of "flower" coins does not need to be the same). How do you do it? Of course, suppose you can't feel with your hand whether the coin is "Gong" or "Hua", and no one will prompt you 9) In a 52 card playing card, shuffle the cards first, and then arrange them from left to right (all open). Now you and your friends take turns to take cards, one at a time, and each card can only be taken from the leftmost or rightmost end. After taking the cards, you and your friends add up the number of cards you get (J, Q, K represent 11, 12, 13), whose number is the biggest, Who is the winner. If the number is the same, it is equal. If you are the first, how do you plan an invincible strategy?
• 7. Logical reasoning problem, The four people's cars are white, silver, blue and red. When they were asked about the colors of their cars, a said: B's car is not white. B said: C's car is red. C said: D's car is not blue. D said: there is one person in a, B, C's car is red, and only this person is telling the truth. If Ding is telling the truth, what colors are a, B, C and D's cars?
• 8. Logical reasoning problem Only one of a, B, C and D got excellent in a certain technical examination. Only one of the following four judgments about their examination results is true. Ask: who is the outstanding one? Which judgment is true? Write down the reasoning process 1) If a does well, then B does well The one with excellent results is C A is the best, not b 4. The one with excellent results is a or D
• 9. Please help to solve a logical reasoning problem According to the statistics of the health and Quarantine Department of S City, compared with last year, the number of enteritis patients in this city has decreased significantly. Authorities believe that this is because the city's drinking water purification project has officially put into use Which of the following can't weaken the above authority's conclusion A. Compared with natural drinking water, the purified drinking water in s city lacks several important trace elements B. The drinking water purification project in s city started five years ago and was officially put into use the year before last C. Last year, s city carried out strict sanitation inspection and rectification on catering industry, especially on the stalls with poor sanitation conditions D. Due to the introduction of new diagnostic techniques, many cases previously diagnosed with enteritis were diagnosed with intestinal ulcer this year
• 10. Finding positive solutions to logical reasoning problems An adult asked his child to buy apples, gave him 3 yuan and asked him to buy 4 apples, but each apple was 2.5 yuan, but the child still had 40 cents left after he bought the apples. Q: How did he buy them?
• 11. A topic of logical reasoning A, B, C, D children playing football, accidentally broke the neighbor's glass A said, "it was B who accidentally caused the trouble." B said, "it was C who caused the trouble." C said: "B is not telling the truth" Ding said, "it's not my fault." Only one of the four told the truth. Who told the truth? Who caused the trouble? Explain why
• 12. A logical reasoning problem! One of the explorers went south for one kilometer, turned west for one kilometer, went north for one kilometer, and returned to the origin. He found a kind of animal unique to the place. What is the most likely animal? (please write down the reasoning process)
• 13. (2006 · Pingliang) a supermarket (shopping mall) was stolen, and a large number of goods were transported away by the criminals by car at night. Three suspects were summoned by the police station, and the police station has mastered the following facts: (1) the criminals are not outside of Party A, Party B and Party C; (2) Party C must have Party A as an accomplice when committing a crime; (3) Party B can't drive a car. In this case, the object who can be sure is () A. Suspect B. suspect C. suspect A. suspect a and C
• 14. 5 6 6 9 ( ) 90 There is some logic between the numbers above. Please fill in the numbers in brackets
• 15. Read the following words and analyze the results as required. In a theft case, there are two suspect A and B, and four witnesses are being questioned. The first witness said, "I only know A theft"; second witnesses said, "I only know B is stealing"; third witnesses said, "at least one of the two testimonies is true"; fourth witnesses finally said, "I am." It is certain that the testimony of the third person is false; through investigation and research, it has been confirmed that the fourth witness told the truth, so who is the thief? Smart you, you know?
• 16. During the winter vacation, Li Ming, Cao Qiang and Wang Jian each did two good things. But no one would talk about what they had done. The little reporter learned that: (1) Li Ming and their three did six good things, such as helping the military family clean up, repairing desks and chairs, taking part in the duty of the neighborhood committee, checking watches and handing them to the police, helping students make up lessons and sweeping snow on the road. (2) when Cao Qiang arrived at the military family home, he found that they had already cleaned (3) after the beginning of school, Li Ming learned that one of the students in the class insisted on helping the students make up lessons every day, and the other helped the military clean up. (4) the police went to the neighborhood committee to ask the students on duty whether they knew the students who had checked the watch. (5) the teacher praised the students who had checked the watch and handed it to the police, and he modestly said that he would learn from the students who repaired tables and chairs. (6) Cao qianghe Wang Jian learned from the neighborhood committee that the students who found the watches were their classmates. (7) the students who repaired the desks and chairs were too busy to help them make up lessons. Please answer: what's the good thing Li Ming did___ What is Cao Qiang doing___ What is Wang Jian doing___ ．
• 17. The four athletes are from Beijing, Shanghai, Zhejiang and Jilin. In swimming, track and field, table tennis and football, each of them participated in only one sport, and their sports are different. In addition, they only know some fragmentary information: (1) Zhang Ming is a ball player, not a southerner; (2) Hu laochun is a southerner, not a ball player; (3) Zhang Ming is a southerner, not a ball player Li Yong shares the same room with Beijing athletes and table tennis players; (4) Zheng Yonglu is not a Beijing athlete, younger than Jilin athletes and swimmers; (5) Zhejiang athletes did not participate in the swimming competition. According to these conditions, please analyze: where are the four athletes from? What sports do you take part in?
• 18. Xiaolan said, I never tell lies Xiao Ming said that what Xiao Lan said was a lie Xiao Hong said that what they said was a lie Ask, who is telling the truth, write the reason
• 19. 2 answer to question 9
• 20. The answers to mathematics exercise 14.1 in Volume 1 of Grade 8