cho a, b thuộc N. chứng tỏ rằng 606a +12006b chia hết cho 6

Các câu hỏi liên quan

Câu 1: Traditional games ______________ an important role in children’s intellectual life. A.bring B.play C.make D.take Câu 2: The owner of the hotel gave us _________ warm welcome. A.an B.the C.a D.X Read the following passage and mark the letter A, B, C or D to indicate the correct word or phrase that best fits each of the numbered blanks. In the last 50 years, the media influence has grown widely with the advance of technology. First was the telegraph, then the newspaper, the radio, the television and now is the Internet. We live in a society that depends on information and communication to keep moving. What we need to be aware is that most of our decisions, beliefs and values are based on what we know for a fact, our assumptions and our own experience. In our work we usually know what we have to do based on our experience and professional knowledge. However, in our daily lives, we rely on the media to get the facts and figures about what is important and what we should be up to date with. As a result, we have to put our trust on the media as an authority to give us the needed information. However, the influence of mass media on our life, work and society is so big that we should know how it really works to select the right pieces of information. What can be used to replace “be aware” in the second paragraph? A.consider B.understand C.have D.depend Câu 4 Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the pronunciation of the underlined part in each of the following questions. A.depart B.car C.market D.scare Câu 5 Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the pronunciation of the underlined part in each of the following questions. A.moved B.passed C.washed D.watched Câu 6 Mark the letter A, B, C, or D to indicate the underlined part that needs correcting in each of the following questions “When he saw this woman, he remembered to meet her somewhere before.” A.to meet B.this woman C.before D.saw Câu 7 He is not a rich businessman and he can’t afford to buy an expensive car. A.If he was a rich businessman, he could afford to buy an inexpensive car. B.If he was a rich businessman, he couldn’t afford to buy an expensive car. C.If he were a rich businessman, he could afford to buy an expensive car. D.If he were a rich businessman, he afforded to buy an expensive car. Câu 8 The cathedral near our school _________ in the 16th century. A.was built B.built C.was building D.builds Câu 9 Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions. A.canoe B.shelter C.offer D.standard Câu 10 This video film/be/so/interesting/I/see/twice A.This video film is such interesting that I saw it twice. B.This video film is so interesting that I saw it twice. C.This video film is so interesting that I have seen it twice. D.This video film is such interesting that I have seen it twice.