Cho tam giác ABC có trực tâm H .Gọi M,N theo thứ tự là trung điểm của BC ,AC.Gọi O là giao điểm các đường trung trực của tam giác a, Chứng minh rằng tam giác OMN đồng dạng với tam giác HAB. b, So sánh AH và OM c, Gọi G là trọng tâm của tam giác ABC.Chứng minh rằng tam giác HAG đồng dạng tam giác OMG d, Chứng minh 3 điểm H,G,O thẳng hàng và GH=2GO

Brighton is a city in the south of England. It’s got a population of about 160,000 and its (1) _________ has made it a popular destination for tourists. Brighton is 85 kilometres (2) _________ London. It’s about an hour on the train. It attracts over 8.5 million visitors annually and is the most popular seaside destination in the UK for overseas tourists. I like Brighton because it’s a friendly place and it’s very pretty. There are some really old buildings and it’s got some nice parks. For tourists, there are a lot of (3) _________ shopping areas, good restaurants, large cultural, music and arts scene. Brighton is (4) _________ to many independent record labels such as Fat Cat Records and Memorials of Distinction. Brighton has several railway stations, many bus routes, coach services and taxis. In spring and summer, (5) _________ students from all over Europe gather to attend language courses at many language schools here. Every time I come here, my (6) _________ places are the beach and the aquarium. For me, Brighton is one of the most beautiful cities in the world. 1) A.location B.located C.locate D.locating 2) A.to B.from C.by D.in 3) A.interesting B.interests C.interested D.interest 4) A.house B.home C.country D.place 5) A. quick B. large C. especial D. favourite

1 Mark the letter A, B, C or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions. You can’t enter this website without a password. A. connect B. stop C. exit D. get access 2 Mark the letter A, B, C or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges. Mary: “Your new dress is so lovely!” Alice: “_________” A. Thank you. It’s nice of you to say so. B. It’s my pleasure. C. Not at all. D. You’re welcome. 3Mark the letter A, B, C or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges. Nam: "Why don’t we go around this place to find a better campsite?" Minh: “_________” A. Certainly. Here you are. B. Yes, I’d love to. C. Yes, please! D. That’s a good idea. 4Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions. I will communicate with you as soon as I have any news. A. get in touch B. cooperate C. discuss D. work in groups 5 Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions. They want to live in the countryside because of the fresh air and the peaceful life there. A. polluted B. cold C. cool D. unpolluted

Tính nhanh a.5 x7+7x12+2x7+7 b.10-11-12-13+14-15+16-17+18

viết đoạn văn nghị luận khoảng 200 chữ bàn về sự hèn nhát trong học tập của học sinh

Giải nhùm em nha em cám ơn ạ

vì sao kinh tế nhà nguyễn kém phát triển

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.(4) THE STAR There are millions of stars in the sky. If you look (1) _______ the sky on a clear night, it is possible to see about 3000 stars. They look small, but they are really (2)_______ big hot balls of burning gas. Some of them are huge, but others are much smaller, like our planet Earth. The biggest stars are very bright, but they only live for a short time. Every day, new stars (3)______ born and old stars die. All the stars are very far away. The light from the nearest star takes more (4) _______ four years to reach Earth. Hundreds of years ago, people (5)_________ stars, like the North Star, to know (6)_________ direction to travel in. Today you can still see that star. A. over B. of C. that D. than 5 Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits blank (5). THE STAR There are millions of stars in the sky. If you look (1) _______ the sky on a clear night, it is possible to see about 3000 stars. They look small, but they are really (2)_______ big hot balls of burning gas. Some of them are huge, but others are much smaller, like our planet Earth. The biggest stars are very bright, but they only live for a short time. Every day, new stars (3)______ born and old stars die. All the stars are very far away. The light from the nearest star takes more (4) _______ four years to reach Earth. Hundreds of years ago, people (5)_________ stars, like the North Star, to know (6)_________ direction to travel in. Today you can still see that star. A. used B. using C. use D. have used Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. You have eat nutritious things to stay healthy. A. nutritious B. have C. healthy D. stay 8 Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. The assistant asked Helen whether those shoes was too small for her. A. whether B. The C. asked D. was 9 Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. If you were on board now, you will experience those marvelous things. A. on board B. will C. experience D. things 10 Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. I disagree because we can’t practise to speak English with native speakers. A. can’t B. because C. with D. to speak

Cách làm bài văn nghị luận chứng minh và giải thích

Chứng tỏ giá trị của A= 1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56 + 1/72 + 1/98 không bằng một số nguyên.