Tại sao người ta thường nối một dây xích bằng kim loại từ xe chở xăng dầu xuống đất khi vận chuyển xăng?

Tìm một số tự nhiên biết rằng nếu xoá chữ số hàng đơn vị của nó đi ta được số mới kém số phải tìm 1816 đơn vị.

(ĐỔI TRỰC TIẾP SANG GIÁN TIẾP) 1 "Don't repeat this mistake again!" the instructor warned the sports¬man. ................................................................................................. 2 "Leave your address with the secretary," the assistant said to me. .................................................................................................. 3 "Phone to me for an answer tomorrow” the manager said to the client. ................................................................................................... 4 "Don't be so silly," the father said to the kid. .................................................................................................. 5 "Give a smile," the photographer said to me. ....................................................................

1. Viết dạng so sánh hơn cho các tính từ sau 1. hot 2. big 3. easy 4.bad 5. far 6.beautiful 7.pretty 8.intelligent 9.hard-working 10.crowded

Cho A = 1 + 2 + 2 ² + 2 ³ + 2 mũ 2004 chia hết 31

Tính nhanh:(56+69).64+489-2106.8:27 Giúp mình nha

13. She has a lot of housework to do. A. There is a lot of housework for her to do. B. There is many housework for her do. C. There is a lot of housework for her do. D. There is many housework for her to do. 15. Sally’s low test scores kept her from _______ to the university. a. admitting b. to admit c. to be admitted d. being admitted 16. I’m really ………….. to the party. All my old friends will be there. A. appreciating B. looking forward C. thinking about D. enjoyable 17. I remember …………………. to Paris when I was a very small child. A. to be taken B. to take C. being taken D. taking 18. The examiner made us ………………… our identification in order to be admitted to the test center. A. show B. showing C. to show D. showed 19. I’ve never fallen in such a(n)…………………….. situation before. A. embarrassed B. embarrassing C. confused D. confusing 20. The plants want………………………daily. A. to water B. watering C. to be watered D. being water 21. In some countries environmental organizations have been ...... to inform people and gain their support. A. made up B. set up C. brought up D. taken up 22. The first quality is…………..A person who is concerned only ………… his own interests and feelings cannot be a true friend. A. unselfishness / with. B. unsensational / for C. unselfish / with D. unselfishness / in 23. We are whispering to avoid by the other ones. A. hearing B. being hearing C. to be heard D. being heard giúp em với ạ, em cảm ơn

Sequoyah was a young Cherokee Indian , son of a white trader and ____ woman A. European B. Indian C. Asian D. African chọn và GIẢI THÍCH giúp mk với . HELP !

II. Fill in the blanks with WHO, WHICH or WHOSE: 1. He arrived with a friend ______ waited outside in the car. 2. The man ______ mobile was ringing did not know what to do. 3. The car ______ the robbers escaped in was a BMW. 4. The woman ______ daughter was crying tried to calm her down. 5. The postman ______ works in the village is very old. 6. The family ______ car was stolen last week is the Smiths. 7. The cowboy ______ is wearing a red shirt looks very funny. 8. A bus is a big car ______ carries lots of people. 9. The volunteers, ______ enthusiasm was obvious, finished the work quickly. 10. Children ______ like music are often good at mathematics. 11. The engineers ______ designed the building received an award. 12. The girl ______ recited the poem is my niece. 13. The townspeople, ______ pride in their community is well- known, raised enough money to build a new town hall. 14. The Pacific Ocean, ______ might have been crossed by raft during the Stone Age, is the world's largest ocean. 15. The newspaper to ______ we subscribe is delivered regularly.

Tìm Max m=(x*căn bậc 2 của y-2 + y* căn bậc 2 của x-3)/xy với x>=3;y>=2