tính 1/3+1/5-1/4= giải bài toán trên

IV. Choose the best answer A, B, Cor D for each sentence. 16. We ……………….from different kinds of pollution: water air, soil and noise. A.is suffering B.suffer C.are suffering D.had suffered 17.The babies when Alice came. A.has slept B.have slept C.is sleeping D.were sleeping 18.America…………….Thanksgiving Day on the fourth Thursday of November since 1864. A.celebrates B.has celebrated C.is celebrating D.celebrated 19.The fish died massively because the water is ………………... A.damaged B.hotter C.contaminated D.poison 20. A natural disaster can cause loss of life or damage. A.property B.house C.home D.money 21…………….. are severe winter storms characterized by heavy snow and strong winds. A.Droughts B.Blizzards C.Hailstorms D.Volcanic eruptions 22.The ……………..can be controlled by the stoppage of leakage from the radioactive materials including the nuclear reactors, industries and laboratories. A.light pollution B.visual pollution C.air pollution D.radioactive pollution 23. English is ………………….of Australia and Singapore. A.native language B.both A and C C.official language D.second language

Gọi tên đồng phân của ankin C8H14? Ankin C8H14 có bao nhiêu đồng phân?

làm sao ạ, ai chỉ em cách giải với ạ

Ex 1. Choose the most appropriate answer. 1. My teacher suggested I _____ harder to pass the exam.     A. studies B. study   C. studying 2. The professor suggested he _____ the research before March.     A. summit    B. summiting   C. summits 3. Her leader suggested _____ on time.     A. being     B. be     C. is 4. Linh suggests they _____ a meeting every week.     A. should have   B. have  C. Both A &B are correct 5. The coacher suggested that they _____ a Facebook group.     A. have    B. has  C. having 6. Her parents suggest she _____ married as soon as possible.     A. get  B. gets  C. got 7. We have suggested _____ to London for this winter vacation.     A. going    B. go     C. should go 8. My older brother suggests that I _____ tennis to have good health.     A. should play  B. playing  C. plays 9. We suggest _____ a postcard to our grandmother.     A. send    B. sending C. sent 10. It’s so cold outside. We suggest _____ the window.     A. should close B. close C. closing

Câu 3. Viết đoạn văn tổng phân hợp (khoảng 9 câu) làm rõ tình yêu nước của vua được thể hiện trong văn bản, trong đoạn có dùng câu cảm thán.

Một vật hình hộp chữ nhật được làm bằng sắt. Khi tăng nhiệt độ của vật đó thì ...

Chứng Minh Rằng : $\frac{1}{ \sqrt[]{1} }$ + $\frac{1}{ \sqrt[]{2} }$ +.....+ $\frac{1}{ \sqrt[]{100} }$ > 10 Giúp mik với

I. Complete the sentences. Use relative pronouns. 1. Is she the manager _____________’s talking over our department? 2. Jody made the best suggestion, _____________ was unusual. 3. The shop on the corner, _____________ I used to buy most of my food, closed last year. 4. The case _____________ was stolen had some valuable papers in it. 5. Ian Fleming, _____________ books have been made into successful films, was a prolific writer. 6. Phillip Pullman, _____________ wrote His Dark Materials, is a fine author. 7. Oksana’s flat, _____________ she bought last year, is near the park. 8. Autumn is the season _____________ I feel most restless. 9. Marcella’s decided to teach abroad, _____________ will be a great experience for her. 10. This is a picture of the place _____________ we’re spending our holidays. II. Write in the missing words. Use one word only in each space. I’m sure there was a reason (1) ___________ I became a TV reviewer. Maybe it was my love of classic shows (2) ___________ kept me entertained as a child. Or maybe it was the presenters (3) ___________ seemed to promise an exciting world of glamour and showbiz. To be honest, I’ve watch so many shows lately (4) ___________ have bored me to tears that I’ve forgotten. Take Kid Swap, for example, the new show (5) ___________ Channel 7 hopes will revive their viewing figures. The show takes kids (6) ___________ parents have had enough and swaps them with kids from other families for two weeks. The problem with this show is that I’m just not sure at (7) ___________ it’s aimed – parents or teenagers. Parents (8) ___________ watch this show will find it childish, particularly at the moment (9) ___________ one of the teenagers does nothing but complain. Teenage viewers (10) ___________ watch more than the first five minutes will soon get bored of the parents, (11) ___________ blame anybody but themselves for the situation. This is definitely one idea (12) ___________ should be put exactly where it belongs – in the bin!

Cho tam giác ABC nhọn, các đường cao BD và CE cắt nhau tại H. Đường vuông góc AB tại B và đường vuông góc với AC tại C cắt nhau tại K. Gọi M là trung điểm của BC. Chứng minh: a) Chứng minh: tgADB~tg AEC và tgAED~tg ACB; b) Chứng minh: HE.HC = HD.HB; c) Chứng minh H, M, K thẳng hàng và góc AED bằng góc ACB. d) AH cắt BC tại O. Chứng minh: BE.BA + CD.CA = 2 BC . e) Chứng minh : HO/ HD +HE/ AO+ BD /CE =1 f) Chứng minh H là giao điểm các đường phân giác của tam giác ODE. g) Cho góc ACB = 45 , gọi P là trung điểm của DC. Từ D kẻ đường thẳng vuông góc với BP tại I và cắt CK tại N. Tìm tỉ số diện tích của tứ giác CPIN và diện tích tam giác DCN. h) Tam giác ABC có điều kiện gì thì tứ giác BHCK là hình thoi? Hình chữ nhật?