Một thỏi sáp cùng với một miếng kim loại nhỏ găm vào nó có trọng lượng 1,50N trong không khí và có trọng lượng biểu kiến 0,40N khi bị nhúng trong nước. Tìm khối lượng miếng kim loại, cho biết khối lượng riêng của sắt à 9g/cm³, của sáp là 0,90g/cm³ và của nước là 1g/cm³. GIải cách đơn giản, dễ hiểu sẽ vote 5* và CTLHN.

Change to the correct form Past Simple or Present Perfect 1 painting the bedroom yet?' 'Not yet. I'll finish it tomorrow.' 2I much last year, but I a lot this year. 3 a holiday recently? 4We last week. We here for 5 days. 5Mr. Barnes is very important in this company. He here for 30 years. 6He loves gardening. He a gardener all his life. 7 anything like this before? 8This the the most delicious dish I . 9I him behave like this before. 10My mother in Scotland.

Cho ba số a,b,c thỏa mãn a^2+b^2+c^2=1 CMR a+b+c+ab+ac+bc<=1+√3

1 cửa hàng ngày 1 bán đc 44,5 kg gạo, ngày 2 bán đc 53,5 kg, ngày 3 bán đc = trung bình cộng của 2 ngày đầu. Hỏi cả 3 ngày cửa hàng bán đc bao nhiêu kg gạo

cali tên tui :> Lê Hà Phuơng đẹp vô nha có tr trí đúng luật hoidap

Các cao nhân giúp với ạ,hleppppp meeeee

Mình đang cần gấp , giải giúp mik với , ghi cả cách giải luôn nha

Complete the sentences for these situations. VD: A(nữ): meet me at the station. B(nam):OK. =>She told him to meet her at the station. Câu 1: A(nam x nữ): Why don't you come and stay with us? B(nam): That would be nice. =>They invited him................................................... Câu 2: A(nam): Don't forget to call Joe. B(nữ): No,I won't forget. =>He reminded her............................................... Câu 3: A(nữ):Be careful . B(nam):Don't worry .I will =>She warned........................................................... Câu 4: A(nam): can you ive me a hand? (???????) B(nam):Sure . =>He asked ............................................................. (nếu có thể thì dịch ra hộ mk nhoa)

I. Choose the word (A, B, C or D) whose underlined part is pronounced differently from the others. 1. A. hates B. works C. stops D. lives 2. A. school B. child C. cheese D. church III. Choose the word or phrase (A, B, C or D) that best fits the blank space in each sentence 3. As soon as the spacecraft ____________ into space, the crew started to observe the sun. A. has travelled B. had travelled C. travelled D. was travelling 4. Do you know the man ____________ car Jack driving? A. who B. whom C. which D. whose 5. Many people became _______________ because of the natural disasters every year. A. homeland B. home sick C. homeless D. homework 6. A ________ is a tropical storm which reaches 120 km per hour in North and South America. A. cyclone B. typhoon C. hurricane D. tornado 7. We couldn’t go on a picnic as planned _____________ it was raining hard. A. however B. but C. because D. so 8. Chocolate and eggs are what children receive _______at _____ Easter. A. at B. on C. in D. with 9. A disastrous earthquake_________ Sichuan in China last May. A. collapsed B. struck C. occurred D. erupted 10. _____________ Christmas Eve, people often have parties late at night. A. In B. At C. On D. From 11. Da Lat, ___________________she spent her childhood, is well-known for beautiful spots. A. that B. which C. where D. when 12. “I promise I won’t be late again.” - “______________________.” A. That’s a good idea B. I hope so C. No, thanks D. I’m sorry I can’t 15. _______ to the Internet, we can get the latest information around the world A. Thanks B. Together C. Apart D. In addition 16. “Would you like a glass of green tea?” - “___________.” A. No, let’s not B. No, I don’t C. No, thanks D. No, I wouldn’t V. Choose the word or phrase (A, B, C or D) that best fits the blank space in the following passage. Before the 1960s, Singapore was essential a trading nation. Since (17) ___________, it has developed a more varied economy and has (18) __________ an important financial, trade, and transportation center. Singapore has many banks, insurance, and finance companies, as (19) ___________ as a stock exchange. Tourism is also important to the economy of Singapore. There is (20) __________ unemployment in Singapore. The country’s annual income per capita (per person) is one of the highest in Asia. The government of Singapore plays a major role in the country’s economy. For example, it decides what benefits, such as vacation and sick leave, must be (21) _________ for workers by employers. It also operates an employment agency to help people find jobs, and it provide (22) __________ for retired workers. 17. A. then B. that C. there D. those 18. A. adapted B. adjusted C. become D. turned 19. A. long B. far C. much D. well 20. A. few B. little C. a little D. a few 21. A. provided B. given C. offered D. handed 2 22. A. wages B. fees C. earnings D. pensions VI.Read the passage, and then decide if the statements that follow it are TRUE or FALSE. The Internet has rapidly developed and become part of our daily life. It is a very fast and convenient way to get information. People use the Internet for many purposes: education, communication, entertainment and commerce. The internet helps people communicate with my friends and relatives by means of e-mail or chatting. However, the Internet has some limitations. It is time-consuming and costly. It is also dangerous because of viruses and bad programs. On the other hand, the Internet users sometimes have to suffer various risks such as spam or electronic junk mail, and personal information leaking. In conclusion, the Internet has both advantages and disadvantages. 23. The Internet has developed very quickly nowadays. T 24. It is very inconvenient to get information from the Internet. F 25. We only use the Internet for studying to improve our knowledge. F 26. The Internet is not only advantageous but also disadvantageous.T 27. According to the passage, it talks about ________________. A. education B. Internet C. entertainment D. chatting 28. The Internet is ______________ in our daily life. A. easy B. difficult C. safe D. important

Mọi người giúp mình câu 5 với mik cần gấp