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Quynhha
2 năm trước
Có một công việc nếu 15 công nhân làm thì hoàn thành sau 6 ngày. Hỏi nếu muốn hoàn thành công việc đó trong 2 ngày thì cần phải có bao nhiêu công nhân làm? Giả sử năng suất mỗi người công nhân là như nhau
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Sử dụng các tù gợi ý để viết thành câu hoàn chin hỉnh. (1đ) 1. People of all ages/ in/ world/ be/ intersted/ use/ Internet. ………………………………………………………………………………………… 2.If/ she/ spend/ more time/ learn/ English,/ she/ will/ pass/ examination/ eary. …………………………………………………………………………………………. Viết lại câu sau bắt đầu bằng những từ đã cho sao cho nghĩa của câu không đổi so với câu đã cho. (2đ) 3. People grow rice in tropical counries. Rice…………………………………………………………………………… 4. They haven’t seen their parents for 3 months They last….…………………………………………………………………… 5. What a pity! I can’t go to the party with you. I wish…………………………………………………………………………… 6. “Will you go to Phong Nha Cave tomorrow?”, I asked the tourists. I asked the tounists Đọc đoan văn và trả lời các câu hỏi sau.(1,5đ) Quang works for an Internatonal Bank in Hanoi. At the moment, he is studying English in London because he needs English for his job. He used to learn English at school and university. But he has forgotten a lot of it. He wants to improve his writing skills because sometimes he has to write letters in English. His listening is terrble. This is his biggest problem. People talk very quickly and he can’t understand them. Quang thinks English is very useful and interesting.He likes to study English well.He hopes he can talk to people from all over the world and understand the words of his favorite songs. 7. Where did Quang use to learn English? ………………………………………………………………………………………… 8. Why does he want to improve his writing skills? ………………………………………………………………………………………… 9. What does Quang think about English? ………………………………………………………………………………………… Chọn một từ thích hợp cho trong khung để điền vào mỗi chỗ trống của đoạn văn sau (1 đ) Climbed in plane summer Paul had a very exciting (10) …………………holiday this year. His French pen-friend invited him to visit her family in the south of France. Paul went by (11) …………………from London to Paris. Marie, his French friend, met him in Paris and together they took a train from Paris to Marseilles. Marseilles is the town where Marie’t family lives. It is a very large port. A lot of people live in Marseilles and there are many interesting shops and cafes there. One day Marie and her parents took Paul for a picnic in the mountains. They (12) …………………a big hill. From the top of the hill, they had a wonderful view. In the distance, they could see the sea. Paul was very sad when it was time to go back to London and school. He is already looking forward to next summer when Marie is going to spend her holiday with his family(13) …………………England. Biến đổi từ cho trong ngoặc ở dạng thích hợp để hoàn thành các câu sau(0,5 đ) 14. Ha Noi is not…………………from Kuala Lumpur. (DIFFERENCE) 15. The Internet has…………………developed in every field. (INCREASE) Chọn từ thích hợp ( ứng với A,B,C hoặc D) mà gạch phần chân có cách phát âm khác với những tù còn lại. (0,5 đ) 16. a. visited b. stopped c. lolked d. watched 17. a. types b. writes c. likes d. finishes Chọn từ hoặc cụm từ thích hợp (ứng với A,B,c hoặc D) để hoàn thành các câu sau. (2,5đ) 18. Ha Noi is …………………most beautiful city in Viet Nam a. b. c. d. 19.-“Would you like to see a movie?”-“ …………………” a. Yes, I do b.Yes, I like c.Yes, I love d.Yes, I’d love to 20. There is a great difference …………………that book and this one a. in b.on c.at d.between 21. They didn’t get up early…………………they were late for school a. but b.so c.because d.because of 22. The Ao dai is the…………………dress of Vietnamese women a. bad b.traditional c.casual d.modern 23. Mathematics and Literature are …………………subjects in high schools a. compulsory b. compulsion c.option d.optional 24. We …………………Mary since she moved to Lon Don a. don’t see b.have’t seen c.hasn’t seen d.didn’t see 25. She said that she…………………to school by bike a. go b.has gone c.went d.going 26. It took me 2 hours…………………this work. a. do b.to do c.did d.doing 27.I used…………………up late when I was young a. staying b.stay c.to stay d.stayed Sử dụng thì hoặc dạng đúng của động từ cho trong ngoặc để hoàn thành các câu sau. 28.Mary often (wash) …………………her clothes in the afternoon 29. Don’t worry! I (give) …………………you a hand. 30. We don’t enjoy (watch) …………………documentaries. 31. Tom doesn’t have a computer. He wisher he (have) …………………a computer.

Chọn từ thích hợp ( ứng với A,B,C hoặc D) mà gạch phần chân có cách phát âm khác với những tù còn lại. (0,5 đ) 1. a. visited b. stopped c. lolked d. watched 2. a. types b. writes c. likes d. finishes Chọn từ hoặc cụm từ thích hợp (ứng với A,B,c hoặc D) để hoàn thành các câu sau. (2,5đ) 3. Ha Noi is …………………most beautiful city in Viet Nam a. b. c. d. 4.-“Would you like to see a movie?”-“ …………………” a. Yes, I do b.Yes, I like c.Yes, I love d.Yes, I’d love to 5. There is a great difference …………………that book and this one a. in b.on c.at d.between 6. They didn’t get up early…………………they were late for school a. but b.so c.because d.because of 7. The Ao dai is the…………………dress of Vietnamese women a. bad b.traditional c.casual d.modern 8. Mathematics and Literature are …………………subjects in high schools a. compulsory b. compulsion c.option d.optional 9. We …………………Mary since she moved to Lon Don a. don’t see b.have’t seen c.hasn’t seen d.didn’t see 10. She said that she…………………to school by bike a. go b.has gone c.went d.going 11. It took me 2 hours…………………this work. a. do b.to do c.did d.doing 12.I used…………………up late when I was young a. staying b.stay c.to stay d.stayed Sử dụng thì hoặc dạng đúng của động từ cho trong ngoặc để hoàn thành các câu sau. 13.Mary often (wash) …………………her clothes in the afternoon 14. Don’t worry! I (give) …………………you a hand. 15. We don’t enjoy (watch) …………………documentaries. 16. Tom doesn’t have a computer. He wisher he (have) …………………a computer. Biến đổi từ cho trong ngoặc ở dạng thích hợp để hoàn thành các câu sau(0,5 đ) 17. Ha Noi is not…………………from Kuala Lumpur. (DIFFERENCE) 18. The Internet has…………………developed in every field. (INCREASE) Chọn một từ thích hợp cho trong khung để điền vào mỗi chỗ trống của đoạn văn sau (1 đ) Climbed in plane summer Paul had a very exciting (19) …………………holiday this year. His French pen-friend invited him to visit her family in the south of France. Paul went by (20) …………………from London to Paris. Marie, his French friend, met him in Paris and together they took a train from Paris to Marseilles. Marseilles is the town where Marie’t family lives. It is a very large port. A lot of people live in Marseilles and there are many interesting shops and cafes there. One day Marie and her parents took Paul for a picnic in the mountains. They (21) …………………a big hill. From the top of the hill, they had a wonderful view. In the distance, they could see the sea. Paul was very sad when it was time to go back to London and school. He is already looking forward to next summer when Marie is going to spend her holiday with his family(22) …………………England. Đọc đoan văn và trả lời các câu hỏi sau.(1,5đ) Quang works for an Internatonal Bank in Hanoi. At the moment, he is studying English in London because he needs English for his job. He used to learn English at school and university. But he has forgotten a lot of it. He wants to improve his writing skills because sometimes he has to write letters in English. His listening is terrble. This is his biggest problem. People talk very quickly and he can’t understand them. Quang thinks English is very useful and interesting.He likes to study English well.He hopes he can talk to people from all over the world and understand the words of his favorite songs. 23. Where did Quang use to learn English? ………………………………………………………………………………………… 24. Why does he want to improve his writing skills? ………………………………………………………………………………………… 25. What does Quang think about English? ………………………………………………………………………………………… Viết lại câu sau bắt đầu bằng những từ đã cho sao cho nghĩa của câu không đổi so với câu đã cho. (2đ) 26. People grow rice in tropical counries. Rice…………………………………………………………………………… 27. They haven’t seen their parents for 3 months They last….…………………………………………………………………… 28. What a pity! I can’t go to the party with you. I wish…………………………………………………………………………… 29. “Will you go to Phong Nha Cave tomorrow?”, I asked the tourists. I asked the tounists…………………………………………………………….. Sử dụng các tù gợi ý để viết thành câu hoàn chin hỉnh. (1đ) 30. People of all ages/ in/ world/ be/ intersted/ use/ Internet. ………………………………………………………………………………………… 31.If/ she/ spend/ more time/ learn/ English,/ she/ will/ pass/ examination/ eary. ………………………………………………………………………………………….

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