Trong thí nghiệm giao thoa Y-âng người ta dùng ánh sáng có bước sóng 600nm, khoảng cách giữa hai khe hẹp là 0,5mm, khoảng cách từ hai khe tới màn là 1m. a. Xác định khoảng vân của hệ vân giao thoa b. Người ta đo khoảng cách giữa hai vân sáng ngoài cùng được L=18mm, tính số vân sáng của hệ.

5:Cho biểu thức B =−5 n+4 a) Tìm điều kiện của n để B là phân số b) Tìm điều kiện của n để B là số nguyên dương c) Tìm điều kiện của n để B là số nguyên âm

Question IV. Complete the folowing sentences, using the question words: What, Where, How many, How much, How far, How long, How old,Whose, Who, Why 1.__________ does his mother do ? – She is a nurse. 2. __________ do you live ? – At 13 Le Duan Street. 3. ___________ don’t you write your excercises ? – Because they are so difficult. 4. __________ do you go to school with? - My best friend, Tuan. 5. ________________ foreign languages do you speeak ? _ Two. 6. __________ are those fashionable hats ? – 100.000 dong. 7. ___________ is your grandmother? – She is 90 years old. 8. __________ is it from your house to school ? – 5 kilometers. 9. ___________ does it take you to school ? – 15 minutes. 10. __________ bag is that ? – It’s Lan’s bag. C.READING Question I. Complete the postcard using the word in the box sun go white eaten having Dear Daisy, It is Nha Trang ! I am ...........................(1) a good time here! The ..................(2) is shining all the time ,and the beaches are so clean :blue sea and .......................................(3) sand ! I have .......................(4) crabs today. They are delicious ! Tomorrow I will ................................(5) to Hon Tre Island. Wish you were here. (1) ………….. (2) ……………… (3) …………….. (4)………………(5) …………... Question II. Read the text and answer the questions: Nam likes sports very much .He jogs in the park every morning .In the afternoon ,he often plays soccer with some friends .They often play it in the stadium near Nam's house .They never play soccer in the street .On the weekend ,he and his friends sometimes go camping in the mountains. They always take food and water .Sometimes ,they camp overnight 1,Does Nam like sports ?............. ............................................... 2,How often does he jog ?.......................................................................................... 3,What does he often do in the afternoon ?............................................................... 4,Who does he usually play soccer with ?................................................................. 5,What do they always take ?............................................................................... Question III. Fill in each blank with one suitable word: There (1) _________ a lot of cable television channel today. People also produce numerous interesting program to entertain people. The (2)___________ program tells us what is happening around the world. The (3)________ makes us laugh and relax after long working hours. The (4)__________ has cute character. Some program can (5)_________ educate and entertain young children such as ‘Let’s Learn (6)_____ VTV2. My (7)____ program is the game show ‘Who’s a millionaire?’. My favorite (8)_____ is Xuan Bac. He is very (9)_________. D.WRITING Question VI: Use but, and, so, because, although to complete sentences. (9)_________. D.WRITING 1.Both my brother…………………..…… I dream of becoming a TV MC. 2.My sister is good at school………………………..…….I am not. 3. …………………………..we tried our best, we didn’t win the game. 4.Peter stayed at home …………………. He was ill. 5.I am tired, …………………………………………… I will go to bed early. Question VII: Rewrite sentences with “but, and, so, because , although”. 1.I don’t watch news. It is boring.(because) ……………………………………………………………………………………………………. 2.She is seeing a movie at cinema.The film is terrifying.(but) …………………………………………………………………………………………………… 3.The programme is boring. The MC is bored.(and) …………………………………………………………………………………………………… 4.I have a lot of homework tonight. I can’t watch Eight Feet Below.(so) ……………………………………………………………………………………………………. 5. BBC The Coast is a famous TV series. I have never watched it.(although) ……………………………………………………………………………………………………. Question VIII. Complete the sentences with and, so, but or because. 1. I didn't feel well ________________ I stayed at home. 2. He liked her ________________ she was happy. 3. I liked Spain ________________ I wanted to go home. 4. She likes swimming ________________ jogging. 5. We were late ________________ there was an accident. Cần đúng 100%

Câu chủ động và câu bị động là gì?Nêu cấu trúc

viết bài luận tiếng anh về singapore ngắn. ngắn mà đủ ý và hay nhé các bạn. mình sẽ vote 5* và ctlhn.

1Many people have donated money to build houses for poor people 2 They were informed about upcoming storm by the local authorities câu nào sai sửa giúp mik nhé

Trứng là tế bào sinh dục cái đã trưởng thành (chín). Tới tuổi dậy thì, buồng trứng chứa khoảng 400.000 tế bào trứng nhưng trong cuộc đời người phụ nữ chỉ có khoảng 400 trứng đạt đến độ trưởng thành. Em hãy tính hiệu suất trứng đạt mức trưởng thành?

1. In spite of his hard work, he could not finish the job. a. As hard as he work b. Despite he worked hard c. Though he worked hard d. Although hard work 2. Despite the fact that it rained, we enjoyed our trip. a. Because of the rain b. Though it is raining c. Despite of the heavy rain d. Though it rained 3. Tom went to work although he didn’t feel very well. a. that he did not feel very well b. despite of the fact not feeling well c. because he did not feel very well d. despite not feeling very well 4. Although he is very old, he can walk to the station. a. In spite of his old age b. Despite his old age c. Despite the fact that he is old d. All are correct 5. I have tried hard but I can’t earn enough money. A. Although I have tried hard, but I can’t earn enough money. B. Although I have tried hard, I can’t earn enough money. C. In spite of I have tried hard, I can’t earn enough money. D. Despite I have tried hard, but I can’t earn enough money. 6. She stayed at home because her mother was sick. A. Despite her sick mother, she stayed at home. B. Because of her sick mother , she stayed at home. C. In spite of her sick mother, she stayed at home. D. A & C are correct. 7. Although he took a taxi, Bill arrived late for the concert. A. Bill arrived late for the concert because he takes a taxi. B. Bill arrived late for the concert because of the taxi. C. In spite of taking a taxi, Bill arrived late for the concert. D. Although Bill took a taxi, he can’t come to the concert in time. 8. In spite of his suffering from a bad cold, William went to school. A. Although William suffers from a bad cold, he went to school. B. Although William suffered from a bad cold, he went to school. C. William went to school although he is suffering from a bad cold. D. William went to school; he suffered from a bad cold although. 9. Despite the fact that it was snowing, I felt warm. A. In spite of snowing, I felt warm. B. In spite of feeling warm, it was snowing. C. Although it was snowing, I felt warm. D. Although I felt warm, it was snowing. 10. Though he tried hard, he didn’t succeed. A. Despite he tried hard, he didn’t succeed. B. In spite of he tried hard, he didn’t succeed. C. In spite of trying hard, he didn’t succeed. D. Even though he tried hard, but he didn’t succeed. 12. John is fat because he eats so many chips. A. John is fat because of the fact that he eats so many chips. B. John is fat because of eating so many chips. C. John is fat because of not eating so many chips. D. A & B are correct. 13. He was very tired but he kept on working. A. Despite he was very tired, he kept on working. B. In spite of he was very tired, he kept on working. C. Though his tiredness, he kept on working. D. Although he was very tired, he kept on working. 14. The trip was boring but we enjoyed it a lot. A. We enjoyed boring trips. B. We are bored with the trip. C. We liked the trip very much though it was boring. D. The trip bored us. 15. Because the medical care is improved, we live healthier. A. Because of the medical care is improved, we live healthier B. Because of the improvement of the medical care, we live healthier. C. Despite the improvement of the medical care, we live healthier. D. B & C are correct. 16. Although he is rich, he feels unhappy. A. He feels unhappy because of his richness. B. He feels unhappy, so he is rich. C. Despite his richness, he feels unhappy. D. He feels unhappy because he is rich. 17. She accepted the job because the salary was high. A.She accepted the job because of the high salary. B. She accepted the job because of the salary. C. She accepted the job in spite of the high salary. D. All are correct. 18. We can study although it is noisy. A. We can study despite of the noise. B. We can study in spite of the noise. C. We can study despite the fact that it is noisy. D. B & C are correct. 19. People want to learn English because it is important. A. Because of its importance, people want to learn English. B. People want to learn English, so it is important. C. Despite its importance, people want to learn English. D. People want to learn English though it is important..

Tính bằng cách thuận tiện 4,86 ×0,25×40=.

giúp hộ tôi bài 4 câu 3 cảm ơn nhiều !