Giải bài toán bằng cách lập pt : Một ô tô đi từ A đến B với 1 vận tốc xác định và trong 1 thời gian đã định. Nếu vận tốc của ô tô giảm 10km/h thì thời gian tăng 45 phút. Nếu vận tốc của ô tô tăng 10km/h thi thời gian giảm 30 phút. Tính vận tốc và thời gian dự định của ô tô

Các câu hỏi liên quan

II. Read the following text and use the words given in the box to fill in the blanks. There are some extra word(s). Comedies; interesting; relax; frog in the well; entertaining; informative; VTV3; exciting; refresh; shows Nowadays, watching television has become a part of the culture of today’s modern society. Each one has his own favourite programs. Phuong likes to watch the News which is on (1) ______ because it’s (2) -_____. It helps her not be a (3) 1. A. procedure B. manner C. means D. technology 2. A. pictures B. photos C. images D. painting 3. A. desk B. bench C. chair D. set 4. A. make B. say C. read D. compose 5. A. By B. Because of C. Through D. In 6. A. home B. space C. sky D. atmosphere 7. A. built up B. worked C. designed D. painted 8. A. happenings B. events C. occurrences D. meeting _____. Trung enjoys watching (4) _______ (5) ______ and 96) _____ himself. And game shows are Thu’s favourite programs because she finds them (7) _____, (8) _____ and (9) _____. She like sitting on her sofa and watching the game (10) ____ like X-factor, Your Face Sounds Familiar, and Who Wants to Be a Millionaire. WRITING I. Combine the two sentences using because, so, but, although, and and. 1. Tom is sleeping. You can’t speak to him at the moment. ________________________________________________________________ 2. My father wanted me to be a doctor. I didn’t. ________________________________________________________________ 3. Mai didn’t understand the lesson. He couldn’t do the homework._________________________________________________________ _______ 4. A bee flew into the room this morning. It stung me. ________________________________________________________________ 5. They put video cameras in shops. They want to stop people from stealing things. ________________________________________________________________ 6. Peter could speak Spanish and French. He couldn’t write them.______________________________________________________________ __ 7. We went to the cinema. The museum closed early.______________________________________________________________ __ 8. They like watching TV. They spend three hours watching it every day._______________________________________________________________ _ II. Rearrange the given words or phrases to make meaningful sentences. 1. information/TV/useful/us/with/ provides. ________________________________________________________________ 2. the children/ are not/ many programmes/ good/ on TV/ for. ________________________________________________________________ 3. game shows/ watch/ on TV/ time/ enough/ don’t/ have/ we/ interesting/ to. ________________________________________________________________ 4. geography/ difficult/ is/ learning/ but/ interesting._________________________________________________________ _______ 5. difficult/ are/ quite/ she’s/ but/ finishing/ exercises/ the/ very/ well/ them. ________________________________________________________________ 6. home/ went/ I/ so/ tired/ was/ I early.______________________________________________________________ __ 7. office/ left/was/ it/ although/ raining/ the/ we/ hard. ________________________________________________________________ 8. wasn’t/ bread/ of/ hungry/ a lot/ I/ but/ very/ still/ ate. ________________________________________________________________ III. Write questions for the underlined parts of the following sentences. 1. My father is in the garden right now. ________________________________________________________________ 2. Mr. Brown is staying at Duy Tan hotel.______________________________________________________________ __ 3. I rode my motorbike to the company.___________________________________________________________ _____ 4. The students are having lunch in the school canteen. ________________________________________________________________ 5. My mother left for work at 6:45 a.m._______________________________________________________________ _ 6. He stayed at home because it rained heavily yesterday morning.___________________________________________________________ _____ 7. He went to the cinema with his classmates._________________________________________________________ _______ 8. My teacheris doing an experiment in the laboratory.__________________________________________________________ ______