Cho tam giác ABC vuông tại A với đường cao AH.Biết BH = 9 cm,CH=16cm.tính: a) độ dài BC,AH,AB,AC. b) số đo góc B Giải giúp mình câu b vs

Hấp thụ hoàn toàn 3,584 lít CO2 (đktc) vào 2 lít dung dịch chứa 7,4g Ca(OH)2 thu được kết tủa X và dung dịch Y. Cho biết khối lượng dung dịch Y tăng hay giảm bao nhiêu so với dung dịch Ca(OH)2 ban đầu ?

Câu 1: Phát biểu quy tắc dấu ngoặc ?Áp dụng bỏ ngoặc (a + b - c) ; - ( - a- b + c )?. Câu 2: Tính nhanh: a) ( 2736 - 75) - 2736 b) ( - 2002 ) - ( 57 - 2002) Câu 3: Bỏ ngoặc rồi tính: a) ( 27 + 65 ) + ( 346 - 27 - 65) b) ( 42 - 69 + 17 ) - (42 + 17 ) Câu 4: Phát biểu qui tắc chuyển vế?. Áp dụng : Tìm số nguyên x biết -2x - 4 = 84? Câu 5: Cho -4 - (27 - 3) = x - (13 - 4) bằng: A. x = 11 B. x = -19 C. x = 29 D. x = -29 Câu 6: Đội bóng đá A năm ngoái ghi được 21 bàn và để thủng lưới 32 bàn. Năm nay, đội ghi được 35 bàn. Tính hiệu số bàn thắng - thua của đội A trong mỗi mùa giải. a) Năm ngoái?. b) Năm nay?.

I (not, need) ____________ some money for my textbooks. 2. (John / travel) __________ to England tonight? 3. I promise that I (love) __________ you forever. 4.Water (boil) _____ at 100 degrees centigrade. 5. My friends (buy) ______ a new car last week. 6. Where ....(be) the meantime 7. Maria and Molly (not, sit) ____________ next to Paul right now. 8. My children (be)________ upstairs now. They (play)_____________ games. 1 điểm is / play are / play are / are playing are / is playing 9. We (not, see) __________ each other for ages. 10. I think Mary ________ (not, pass) the exam easily next week. 11. ____________ (Tom, lose) weight? He is thin and looks good. 12. I _________ (not, play) this game when I was a child. 13. Viết lại câu và sử dụng từ gợi ý trong ngoặc: "We have learnt at this school since we were 17." (start) --> We ..................................................... 14. Viết lại câu và sử dụng từ gợi ý trong ngoặc: "John began eating pizza 4 years ago." (for) --> John................................................. 15. Viết lại câu và sử dụng từ gợi ý trong ngoặc: "I have never been to Sapa before. " (first) --> This is................................................. 16. Viết lại câu và sử dụng từ gợi ý trong ngoặc: "We haven’t seen him since 2000. " (saw) --> The last....................................................... 17. Viết lại câu và sử dụng từ gợi ý trong ngoặc: "The last time she went out with him was 2 months ago. " (gone) --> She........................................................... 18. Viết lại câu và sử dụng từ gợi ý trong ngoặc: "It’s 2 years since I last met him. " (for) --> I............................................................. * 19. Viết lại câu "Play with matches and you will hurt yourself. " --> If............................................................. 20. Viết lại câu "Put the knife down or you will cut yourself. " --> If.............................................................

Call : ''Marie Curie (1867 – 1934)'' NL : Chúc mừng chị Nhi nhà tui dậy thì thành công ^O^

Giả bài sau theo các bước : B1 : Tìm ĐK để pt có 2 ` n^o ` ` x_1 ` , ` x_2 ` Tìm ĐK để pt có 2 ` n^o ` ` x_1 ` , ` x_2 ` $\left \{ {{ a \ne 0 } \atop { Δ \geq 0 }} \right.$ B2 : Áp dụng định lí vi - ét tính được ` S ` ` = `` x_1 + x_2 ` , ` P ` ` = ` ` x_1 . x_2 ` B3 : Từ ĐK ( T ) và S tính ` x_1 ; x_2 ` theo ` m ` thế vào ` P ` để tìm thử lại ĐK

Choose the word having “E” pronounced differently with others. 1,desert 2,held 3,celebrate 4,prefer Choose the word having “ED” pronounced differently with others. washed attended decided disappointed Câu 3 Find the words which has a DIFFERENT STRESS pattern. expensive difficult dangerous beautiful Câu 4: Chose the word having “A” pronounced differently with others. plane station pavement traffic Câu 5 :Find the words which has a DIFFERENT STRESS pattern. significant excellent wonderful marvelous Câu 6: Find the words which has a DIFFERENT STRESS pattern. hospital tomorrow motorbike exercise Câu 7 :Find the words which has a DIFFERENT STRESS pattern. enter include agree decide Câu 8:Find the words which has a DIFFERENT STRESS pattern. 2 science motion design fiction Làm mình cả trong hình và ngoài hình

among young children A emailing B. video chatting 23. The road in front of my office is always A. to flood B. flooding 24. A severe tropical A. drought B. rain 25. If you were the president, what A. will 26. A person who C. telepathy D. social media when it rains heavily. C. flood is called a typhoon. C. flood D. flooded you do to help the environment? B. did C. would the bagpipes is called a piper. B. performs 27. The team's success was largely A. because B. due to her efforts. A. plays C. entertains C. since 28. The Maori in New Zealand greet each other by A. punching B. touching C. blowing 29. Australia is composed of seven 30. There is a red maple A. nations B. countries leaf on the B. banner D. do D. does D. however their noses. D. smelling C. states of Canada. C. money Question III. Give the correct form of the following words A. flag 1. If we use water carefully, more people (have). 2. If the factory (continue) D. storm D. provinces D. billboard fresh water. animals will die. dumping poison into the lake, all the fish and other a science fiction film on TV at 9.00 tonight. 3.1 (watch) 4. Many houses (destroy) 5. You (not pass) in the hurricane last night in Nghe An. your driving test unless you drive more carefully. 6. He'll be ill if he (not stop) 7. By the time the police came, the thief (leave) worrying so much. 8. We (save) 9. Four countries thousands of trees if we don't waste paper. (visit) by John so far. 10. London (have) a population of eight million people. 11. The Statue of Liberty in New York is a monument which (symbolize) freedom. 12. Vietnam's Independence Day (celebrate) on September 09th. (visit) Sydney Opera House for several times. 13. We 14. Some activities 15. Don't forget (turn), C.READING (prepare) to celebrate the lunar new year now. off the lights before going to bed. Question I. Complete the passage with the given words in the box. step people numbers food damage clothing Natural (1).. life or (2)... become disasters can be destructive; they can wreak havoc across large areas and cause loss of to property. We cannot prevent natural disasters, but we can prepare for them. The first (3)... is to learn about the risks in your area and read the information about natural disasters on local government sites. Next, find out what the rescue and emergency workers advise. These (4)...have been trained to deal with disasters, have been through lots of them and know how to help. Make sure you have all the emergency contact (5)...... .........entered in your mobile phone. It is also important that you put together an emergency supply kit. Your emergency supply kit should include (6)...... .............. water, medications, personal hygiene items, copies of personal documents and some money. You may also need some extra (7).... force people to leave their homes so you should also (8)...... if you live in a cold climate. Natural disasters can familiar with the guidelines for evacuation. Plan safe places to meet your family and get to know the evacuation routes and shelters. Question II Read the passage and answer the questions. Visual pollution has a greater effect on people than you may think. I remember when I went to a big city, I was mally scared because so much graffiti on the buildings' wall. Then I looked up, and I saw a lot of power lines aquatic

“Thành thị là hình ảnh tương phản với lãnh địa”. Sự tương phản đó thể hiện như thế nào?

Nếu đốt nóng một băng kép được cấu tạo bởi 2 lá kim loại mỏng là sắt và đồng dán dính vào nhau thì: A.Băng kép sẽ bị cong về phía lá sắt. B.Băng kép sẽ bị cong về phía lá đồng. C.Băng kép không bị cong, chỉ nở dài ra thôi. D.Cả ba đáp án trên đều sai.