(1-1/21).(1-1/28).(1-1/36)......(1-1/1326) cho mik hỏi là muốn giải bài này thì mik phải tính kq của trong ngoặc trước đúng không ạ được bao nhiêu thì ta tách ra thành 2 số tiên tiếp hoặc cách nhau bao nhiêu đơn vị nếu tách ra không thể gạch chéo được thì ta lấy kq ở trong ngoặc nhân với 2 hoặc 3,4,5...... rồi tách ra nếu thành 2 số liên tiếp và cách nhau từng đấy đơn vị thì ta chọn.Dạng này thì làm thế ạ mik nói đúng không ạ và làm bài trên cho mik giải chi tiết từng bước giải xong mik vote 5 sao cảm ơn nhiều ạ giúp mik với

Mn giúp mik tí nha bài khó quá giúp đi mik giúp lại nha cảm ơn mn rất rất nhìu lun á i love you

Giúp mik với bài 1 quy đồng các mẫu số a) 8/3 ; -4/5 ; 5/7 b) -17/12; -31/-18;8/-15 bài 2 rút gọn các phân số sau rồi quy đồng các phân số sau 4.5+4.11/8.7-4/3 ; 2 mũ 4 .5 mũ 2 .7/2 mũ 3.5.7 mũ 2 . 11 bài 3 Tìm tất cả các phân số có tử 15 lớn hơn 3/7 và nhỏ hơn 5/8

Cặp chất nào sau đây không tác dụng với oxi? A. Sắt, đồng B. Bạc, vàng C. Cacbon, hidro D. Photpho, kẽm

dành cho blackpinkblink, thuthao nha tìm cho mình vài cái hình hanako đẹp,ngầu. hoặc vẽ cũng được nhưng mà vẽ trên giấy trắng như A4,... khoảng 4 hình nha

Mọi người giải dùm mình bài tìm x (-40)-(18+x)=20 với

Read the following passageand mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. When you hear how I learned a foreign language, you have to remember a few things. In 1993, when I started learning English, no one had heard of the Internet. I wasn’t able to read websites on topics that I found interesting or follow blogs. And I have no idea how I decided which movies to see without my favourite movie review website. My reading practice was limited. All I had were a few books on sale locally. For listening practice, I only had the news and cartoons on cable TV. People bought and rented videos but in Poland there was no spoken English on them. The only way to hear that was to visit the movies. My dictionaries were all in book form until I received my first PC dictionary. It came on at least six disks and had unhelpful explanations and few example sentences. It doesn’t sound very useful but I loved it because of its ability to work with other programs and find English words more quickly. Today, computerized dictionaries have simple explanations and lots of examples. Now I can spend hours on the web, reading about my favourite topics, downloading up-to-date movies, emailing English-speaking friends and posting comments on forums. a. The writer liked his first computer dictionary because it ____________________. A: was better than today’s dictionaries B: gave you useful example sentences C: came with other computer programs D: found information at a faster speed b. What is the writer trying to do in the text? ____________________. A: Encourage people to start learning in a foreign language. B: Compare two different ways of teaching a language. C: Explain how language learning materials have changed. D: Complain about the use of technology in language learning. c. The word “up-to-date” means ____________________. A: longest B: oldest C: latest D: daily d. To watch films in English, Polish people in the 1990s had to ____________________. A: rent films on videotape B: watch TV for children C: go to the cinema D: have cable television e. The writer says he doesn’t know ____________________. A: where he bought English book online from B: when he first heard about the internet C: how he used to choose films to watch D: which topics he found interesting

I. Choose the correct answer A, B, C, or D for each of the gaps to complete the following text. (5ms) Tokyo, the capital of Japan, is a big city. The city is filled with factories, large office buildings, banks, restaurants, and shops of all sizes. It is a (1)……… for Japanese art, and is home to more than 100 colleges and universities. The city is (2) …………… an important seaport. Most Japanese companies have (3)…………. main offices in Tokyo. At the heart of Tokyo is the Imperial Palace. This is the place (4)………….the Emperor of Japan lives with his family. Tokyo is one of the world's biggest and most crowded (5)……………… 1. A. house B. city C. center D. capital 2. A. and B. also C. but D. so 3. A. its B. their C. theirs D. some 4. A. what B. where C. which D. for 5. A. city B. a city C. cities D. the cities II. Read the passage, and then choose the correct answers. (5ms) San Francisco, a very hilly city, is in the San Francisco Bay. Although there are many modern skyscrapers in the city center, houses in the suburbs are in the styles of the 19th century. The celebration of the Chinese New Year in San Francisco's Chinatown is one thing that you should not miss. You can find the best food from around the world: Brazilian, Indian, Japanese, Korean, Mexican, Russian, Thai, Chinese and much more. Don't forget to visit a jazz club or an outdoor coffee shop to enjoy good coffee and fresh air. You should visit Mission Dolores, an old church built by the Spanish in the 18th century. 1. Which of the following sentences is true about San Francisco? A. San Francisco is not a very hilly city. B. San Francisco is not in the San Francisco Bay. C. San Francisco has only old houses. D. San Francisco is a city with modern skyscrapers in the city center. 2. What is second paragraph about? A. nightlife B. festivals C. scenery D. architecture 3. Where can we have coffee and enjoy fresh air? A. Chinatown B. Old houses C. Churches D. Outdoor coffee shops 4. Which of the following sentences is NOT true about San Francisco? A. San Francisco is in the San Francisco Bay. B. The celebration of the Chinese New Year in San Francisco's Chinatown is very interesting. C. You can only enjoy American and Chinese food in San Francisco. D. You should enjoy jazz at a jazz club in San Francisco. 5. By whom was Mission Dolores built in the 18th century? A. By people from Germany. B. By people from Spain. C. By people from Brazil. D. By people from Europe. The end.

giúp mình câu này nhé Cho hình chóp SABC có SA ⊥ (ABC) và AB⊥BC , gọi I là trung điểm BC. Tính góc giữa hai mặt phẳng (SBC) và (ABC) .

So sánh thể tích khi oxi và ozon cần dùng để phản ứng hết với 12,8g Cu