Một đội công nhân phải lắp đặt 4560 m đường ống nước trong 3 ngày . Ngày thứ nhất đặt được 32 % số mét ống nước đó , ngày thứ hai đặt được 33 % số mét ống nước đó . Hỏi : a. Ngày thứ nhất và ngày thứ hai mỗi ngày lắp được bao nhiêu mét đường ống nước ? b. Ngày thứ ba còn phải lắp đặt bao nhiêu phần trăm số mét ống nước nữa thì hoàn thành

Các câu hỏi liên quan

1​. Read the article and tick A, B, or C. Young at heart and in body! Today people are living a lot longer than they used to and their lives are much healthier, too. Older people used to say that they were ‘young at heart’ when they looked old but felt young. Now, people want to look as young as they feel and they are prepared to spend a lot of money on surgery. If an operation can give people a younger face or body then they will have it and not worry about the dangers or the cost. People have always looked for eternal youth and maybe they have now found it. As well as trying to look younger, people can have a lot of other operations. They can become bigger or smaller. They can have a different nose or more hair. They can even become taller or shorter! In fact doctors can probably change any part of the body that you are unhappy with – for the right money! The number of people who have these operations is continuing to go up. Last year in the UK there was an increase of 22%! And it is not only women who want a perfect body. More and more men are choosing to have surgery, too. The most popular operations for men include changing their nose or ears, and fat reduction. It is also worrying that many young people are having surgery. It is becoming so popular and cheap that some eighteen-year-olds are getting operations as presents for their birthdays! However, these operations can be dangerous and they can also cause a lot of pain. Sometimes the operations go wrong and the person may look worse than before. There are some terrible stories and there have been some frightening programmes on television. Although there are problems, people continue to take the risks. In the past, only the rich and famous had enough money to pay for these operations but today the prices are much lower. Many more people today have the opportunity to look younger or to look like their favourite celebrity. Although it costs money and is dangerous, millions of men and women still have surgery because they want a perfect body. 1​. People live much shorter lives today than before. ​A. True B. False C. Doesn’t say 2. ​People look younger because their diets have improved. ​A. True B. False C. Doesn’t say 3​. People spend a lot of money on their health. ​A. True B. False C. Doesn’t say 4​. Some operations can make people thinner. ​A. True B. False C. Doesn’t say 5​. More men than women have surgery. ​A. True B. False C. Doesn’t say 6​. More people had surgery last year than ever before. ​A. True B. False C. Doesn’t say 7​. These operations are completely safe. ​A. True B. False C. Doesn’t say 8​. Some men want to change their ears. ​A. True B. False C. Doesn’t say 9​. Teenagers under eighteen can have surgery. ​A. True B. False C. Doesn’t say 10​. These operations are extremely expensive. ​A. True B. False C. Doesn’t say

V. Write the opposite. 1. ​turn up (the radio)​___ 2​. put on (a coat)​___ 3​. forget (a name)​___ 4​. get better​___ 5​. stand up​___ VI. 1​. When I saw her she was walking ____ the lake. ​across through towards 2​. Last night we ___ a cake for his birthday. ​made did paid 3​. She always ___ a handbag. ​wears puts carries 4​. Go ___ the supermarket and the bank is on your left. ​over past along 5. ​I ___broke my friend’s camera. ​luckily accidentally immediately 6​. He looks ___his father. ​like as same 7​. I looked ___ the new words in the dictionary. ​down through up 8​. A​: I love computer games. ​B​: ____ do I! ​So Also Neither 9​. I’m looking ___Jan’s baby while she’s out. ​forward after for 10​. I gave ____ smoking two years ago. ​down off up 11​. I am working very hard because I want to ____ at 50 and go travelling. ​retire separate leave 12​. Did you know text-messaging was ____ by a Finnish company? ​discovered invented designed 13​. I went to Morocco in August and it was ___ hot. In fact it was boiling. ​a bit quite incredibly 14​. The lion looked asleep but it ___ jumped up and ran away. ​luckily accidentally suddenly 15​. The little girl said she wanted to get married and ___ ten children. ​have get become VII. Complete the sentences with one word. 1​. The student ___ me he had been in the school for a month. 2​. A: ​Shall we go out for dinner? ​B​: That’s OK. I ___ mind cooking. 3. ​I’m looking ___ Ben. Have you seen him? 4​. I get on very __ with Jackie. She’s like a sister to me. 5​. I do the same thing every day. It is so ___. I want to do something different and more exciting. 6​. We walked ___ the bridge to see the ducks in the river. 7​. I cooked the meal and my wife ____ the washing up. 8​. Please don’t ___ a noise. The baby’s sleeping. 9​. A​: What are you doing here? ​B​: I’m waiting ___ a friend. 10​. The boy ___ that he wanted to dance with me. VIII. Underline the stressed syllable. 1​. newspaper 2​. kangaroo 3​. invented 4. ​divorced 5. ​salary 6​. elephant 7​. towards 8​. dolphin 9. ​imagination 10​. directed IX. Match the words with the same sound. hope get tiger forget turn divorced discover wear enjoy finish 1​. promise​___ 2​. dangerous​___ 3​. across​___ 4​. mosquito​___ 5​. whale​___ 6​. elephant​____ 7​. throw​__ 8​earn​_______ 9​. pretend​____ 10​. try​___