user-avatar
mai993615
2 năm trước
Một thuyền máy và một thuyền chèo cùng xuất phát xuôi dòng từ A đến B. Biết AB dài 14km. Thuyền máy chuyển động với vận tốc 24km/h so với nước. Nước chảy với vận tốc 4km/h so với bờ. Khi thuyền máy đến B nó lập tức quay về A và lại tiếp tục quay về B. Biết thuyền máy và thuyền chèo đến B cùng lúc. a) Tìm vận tốc thuyền chèo so với nước. b) Không kể 2 bến sông A, B, trong quá trình chuyển động hai thuyền gặp nhau ở đâu?
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

1. The prison population in this state, now at an all-time high, is higher than any other state. A B C D 2. In the 1840s, Joseph Henry made important discovery in electromagnetism. A B C D 3. The fact that wind power is one of the most abundant and increasingly cost-competitive energy A B resources make it a viable alternative to fossil fuels. C D 4. Each year people around the world spend billion of dollars buying goods on the Internet. A B C D 5. Preserving natural resources mean reserving them for our future. A B C D 12. ______ little we may like it, old age comes to most of us. A. In spite of B. So C. As D. However 13. One must obey the law, ______. A. however he is old or young B. however old or young he is C. whatever he is old or-young D. whatever old or young he is 14. By the age of twenty-five he had ______ his ambition of becoming a pianist. A. reached B. completed C. achieved D. obtained

CHIA ĐỘNG TỪ 1.It wasn’t very surprising that he (start) getting toothache. He (eat) a lot of candies. 5. All the people in the bank (make) (sit) on the chairs. 8. The people (live) next door to my house (always have) parties. It’s so annoying. 9. It is highly desirable that every effort (make) (reduce) expenditure. VIÊT LẠI CÂU 8. I’m sure they didn’t show up here last night. They _____________________________________________________________________________ 10. It is quite obvious that we shall have to work faster in order to finish the project on time. There is no ________________________________________________________________________ 2. "You've broken my glasses, Frank!" said Jane. (BREAKING) 5. Staying on late at work is becoming less of a problem for me. (USED)

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team