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2 năm trước
Mỗi đơn vị của bảng kích thước `10 × 10` (10 dòng 10 cột) được ghi một số nguyên dương không vượt quá `10` bất kì hai số nào ghi trong hai ô chung một cạnh hoặc hai ô chung một đỉnh của bảng là hai số trùng nhau. Chứng minh rằng có số được ghi ít nhất `17` lần.
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Các câu hỏi liên quan

1. If it hadn’t been for the soft ground, my horse________. A. will won B. would win C. would have won 2. What________you do if you found a burglar in your house? A. do B. will C. would 3. If you slept under a mosquito net you________bitten so often. A. wouldn’t be B. won’t be C. wouldn’t have been 4. If we leave the car here it ________in anybody’s way. A. won’t be B. will be C. would be 5. I________ruined if I bought her everything she asked for. A. would have been B. would be C. will be 6. I could tell you what this means if I________Greek. A. know B. knew C. had known 7. Unless he________more he won’t get much money. A. sells B. doesn’t sell C. will sell 8. If I lend you $10 when________you repay me? A. do B. will C. would 9. We’ll have to move upstairs if the river________any higher. A. had been risen B. would rise C. rises Question 10. If I spoke English , my job __________a lot easier. A.was B.were C.will be D.would be Question 11. I will lend them some money If they __________me . A.ask B.will ask C.asked D.had asked Question 12. My dog will bark if it__________any strange sound. A.hear B.hears C.heard D.had heard Question 13. If I __________enough money ,I will buy a house. A.had B had had C.will have D.have Question 14. If you __________away , I will send for a policeman. A.not go B.don’t go C.hadn’t gone D.didn’t go Question 15. If I __________in your place , I would accept Mr Anderson’s invitation . A.were B.am C.be D.was Question 16. What __________we do if they don’t come tomorrow? A.would B.will C.did D.had Question 17. If I __________you, I would tell the truth. A.is B.am C.were D.was Question 18. If I had enough time now , I__________to my parents. A.would write B.write C.will write D.wrote Question 19. If she __________late again , she will lose her job. A.come B.came C. comes D.had come Question 20. I will let you know if I__________out what’s happening . A.find B.finds C.found D.had found Question 21. If we __________in a town , life would be better . A.live B.lived C.would live D.had lived Question 22. If I won the lottery , I __________you half the money . A.gave B.had given C.will give D.would give Question 23. It __________be a pity if she married Fred. A.will B.would C.can D.may Question 24. If I’m free on Saturday , I __________to the mountains. A.to go B.could go C.went D.can go Question 25. We __________.you if we have time . A.will phone B.would phone C.phoned D.had phoned

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