một người đi xe đạp từ A đến B với vân tốc 15km/h . Lúc về người đó đi vơi vận tốc 12km/h ,nên thời gian về lau hơn thời gian đi là 30p . Tính SAB =?

Các câu hỏi liên quan

II. Find the word which has a different sound in the part underline. 1. A. prefer B. better C. teacher D. worker 2. A. bear B. hear C. dear D. near 3. A. collect B. concern C. concert D. combine 4. A. absent B. government C. dependent D. enjoy 5. A. future B. return C. picture D. culture III. Match the noun from the box with the correct. 1. go: 2. do: 3. collect: 4. play: 5. take: 6. watch: IV. Put one of the verbs from the box in each blank with the correct form. 1. The children are a play at the end of term. 2. When did you start antique glass? 3. What kind of music do you to? 4. Irene won’t be able in the match on Saturday. 5. I’ve never skiing. 6. He spent a pleasant afternoon the book. V. Complete the sentences with the words in the box. 1. I really like - especially in the sea. 2. I’m interested in . My favourite band is T-ara from Korea. 3. I love . I go to the cinema every weekend. 4. I really like . I don’t play it, but I watch matches on TV. 5. My hobby is . I have a new camera. 6. I love . My favourite writer is To Hoai. 7. I really love in the park with my friends. 8. I like . I play against my dad. I also play against other people on the Internet. VI. Put the verbs in brackets in the correct verb form. 1. Nam’s friends often (give) him stamps from other countries. 2. My sister (practise) the guitar twice a week. 3. I (see) a film this Sunday evening. (you/ go) with me? 4. They (give) a party next week. 5. The members of the stamp collectors’ club (meet) at the library next Friday. 6. (you/ be) free next Sunday. 7. We (live) near Nam’s house, but we (not see) him very often. 8. Don’t worry. I (go) fishing with you next Saturday morning. VII. Write the name of the hobbies from the box into each blank according to the description. 1. At first, people preferred to collect by country. They chose one topic in their own country. Nowadays, people enjoy collecting in topics from several countries. The most favourite themes are sports, art and music, birds and flowers, etc. 2. Many people enjoy this hobby because they have a close contact with outdoors, exercise, and nature. They also gain a knowledge of insects. 3. Today this hobby becomes very popular in the world. For many people, it is a form of exercise and an enjoyable leisure activity. With a little soil, some seeds, and a few basic tools, people can enjoy creating a beautiful thing and watching it grow. VIII. Complete the text with the verbs in the box in the correct form. Maybe some verbs can be used more than once. John has a lot of hobbies. He (1) chess at school and he also (2) skating. After dinner, he (3) for a walk and he (4) to music every evening in his room. John loves sports. He (5) athletics at school, and he (6) football after school. On Saturdays, John and his friends (7) swimming. On Sundays, they (8) basketball in the park. On Sunday evenings, they sometimes (9) a film. IX. Write questions for the answers. 1. A: Where on holiday? B: I like going to the mountains on holiday. 2. A: Who at school? B: I like sitting next to my friend Jack at school. 3. A: What kind to? B: My friends like listening to rap music. 4. A: What on Sunday evenings? B: I enjoy going to the cinema. X. Rearrange the sentences to make a suitable conversation by writing the correct number in the box.  Those are posters of my favourite singers.  Singers? They’re very nice. Thank you.  They’re my favourite T-shirts.  Hi. Tell me about your collections. What are these?  Oh, they’re interesting. And what are those? XI. Choose the correct answer A, B, c or D to fill each blank in the following passage. Coin collecting is one of the most popular hobbies in the world. Most coin (1) enjoy trying to have a complete set of a country’s coins. Some people collect coins for pleasure; (2) collect coins in order to sell them later. From coins, we can also (3) something about certain famous people and events in a country’s (4)______. Many beginning collector go to the bank and buy coins. Then they (5) coins for their collection. 1. A. collectors B. collecting C. collected D. collections 2. A. another B. other C. others D. the other 3. A. teach B. learn C. give D. offer 4. A. history B. nature C. science D. geography 5. A. look B. see C. watch D. find

XII. Read the article and then decide whether the statements are true (T) or false (F). After school Susan goes home to do her model-making. She loves making models. She started about a year ago. She needs about two weeks to make a model. Then she puts it on the shelf in her bedroom. She has about twenty models now. She thinks she will need to get another shelf soon. Last term she tried to start a club for model-making at school but the teachers and other children weren’t interested. She thinks she has a lot of fun anyway. 1. Susan makes models when she stays at school. 2. She has made her models for about one year. 3. It takes her two weeks to make two models. 4. She will need another shelf for her models soon. 5. Susan tried to start a club for model making and the teachers and other children were interested in it very much. XIII. Read the passage, and then choose the best answer. Along with jogging and swimming, cycling is the best all-round forms of exercise. It can help to increase your strength and energy, giving you a stronger heart. You don’t carry the weight of your body on your feet when cycling. It is also a good form for people with a pain in your feet or your back. You should start your hobby slowly. Doing too quickly can have bad effects. You should cycle twice or three times a week. If you find you are in pain, you will stop and take a rest. 1. Why is cycling a good form of exercise? 2. Why might people with a pain in the back go cycling? 3. What will happen if you do too quickly? 4. How often should you go cycling? 5. What will you do if you find you are in pain?