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câu 1 mình chép đúng đề rồi, không sai đâu @_@

Tui không hiểu gì cả, giải cụ thể đi @cậu là của tớ???

Bài 1: Tính tổng A = 1.(C_{n}^{0})^{2} + 2.(C_{n}^{1})^{2} + ... + n.(C_{n}^{n})^{2} B = \frac{C_{n}^{0}}{1} + \frac{C_{n}^{1}}{2} + ... + \frac{C_{n}^{n}}{n+1} (số hạng tổng quát) Bài 2: Cho mạch điện như hình vẽ: a) Có bao nhiêu cách để thông mạch từ A đến B b) Có bao nhiêu cách để không...

Hi all! :D Welcome a new member of our class: 15. Lê Thuận An - Hưng Yên @Ann Lee Yociexp95

1.I find Harold’s behavior quite incomprehensible. (loss) I find myself at a loss to understand/ comprehend Harold's behavior. at a loss: bối rối, lúng túng 2. The severity of the punishment bore no relation to the seriousness of the crime.(proportion) The punishment was out of proportion to the...

transformation: 1>She said she must see the manager immediately => She demanded to see the manager immediately 2> I want to sit in the front row => I'd rather sit in the front row 3> My boss wouldn't let me leave early => My boss refused to let me leave early 4> where would you like to go this...

1. Alternative medicine is a complete mystery to some people. => Some people are.strange to alternative medicine.. 2. We'll not see each other again before I go. => This will be the last time.we see each other.. 3. He was looking forward to going home again. => He couldn't.wait to go home...

Chuyển các câu sang các thể: khẳng định,phủ định và nghi vấn 1 We/study english/now (+) We're studying English now (-) We aren't studying English now (Y/N) Are you studying English now? (Wh-question) What are you studying now? 2 At the moment/Chi and Mai/listen to music (+) At the moment, Chi...

Complete the sentences, using the correct form of the words in brackets. 1. Scientists say that exhaust fumes are___poisoning___ our city. ( poison) 2. Many seabirds were___dead___ because of the oil spill. (die) 3. Waste from households will gradually ___contaminate____ the lake...

1. Mr. Thanh has ...............an............. appointment at 4o' clock ...............(no answer)............. this afternoon. 2. Yesterday ................the........... dentist fill ...........a............. cavity in my tooth. 3. What's ........(no answer)............. wrong with Sue? -...

1. In the hotel lobby the detective caught __________of the man he had been hired to follow. A. glance B. view C. vision D. sight catch sight of sb / sth : thoáng thấy ai / cái gì 2.Of course I didn’t break it ____________ purpose- it was an accident! A. by B. with C. from D. on on purpose: cố...

he showed unswerving.....loyalty.....to his friends unswerving (adj): kiên định => sau nó phải là 1 danh từ => Chọn loyalty Có cụm: unswerving loyalty: lòng trung thành kiên định

P/s: Bạn thông cảm, mình hơi lười xíu ^_^

buồng lái receiver

Do chức năng tag bị lỗi nên chị tag 2 lần nhé! :D Các em xem nội dung ở #165, #167 21. Lê Thị Lương Uyên - Nghệ An @Ocmaxcute 22. Nguyễn Thị Minh Phương - Hải Phòng @Tuệ Phương 23. Lê Nhật Hiền Nhi - Nghệ An @Hiền Còi 24. Đỗ Thùy Linh - Nam ĐỊnh @Một Nửa Của Sự Thật 25. Nguyễn Nga Hoàng - Bình...

1," I will help you with the housework before the game show on TV." -> She promised...........to help me with the housework before the game showed on TV........... 2, Junk mail is advertisements that we receive through mail that we have not asked for. -> What we receive.............through mail...

1. B => bỏ "to" 2. A => asked / told 3. D => bỏ 4. C => I would like 5. C => she liked 6. A => asked 7. B => enjoyed 8. D => the next Wednesday 9. A => it was 10. C => there were 11. D => he would 12. B => wanted 13. B => if Hong 14. C => worked 15. D => didn't 16. D => that 17. D => bỏ 18. A =>...

Hi everyone! :D Hôm nay chị sẽ chữa bù bài tập của Lesson 2: CITY LIFE (Lần trước chúng ta kiểm tra nên chưa chữa ^_^ ) Ex1: Thay các từ gạch chân bằng hình thức đúng của cụm động từ trong bảng 1. The plane left on time. took off: cất cánh (máy bay) 2. We intended to interrupt our trip in...

OK em! ^^ ------------ Our class, let's welcome her! :D 32. Nguyễn Thị Trúc Vi - Bình Định @Vi Nguyen

Hi all! :D Key for Lesson 3: Teen Stress and Pressure Ex1: Put the following sentences into indirect speech. 1. He said to her, "You are my friend." => He said (that) she was his friend. 2. "We will wait until tomorrow", they said. => They said (that) they would wait until the following day /...