Lập phương trình các cạnh tam giác ABC khi biết: Đỉnh A(2;1) và trung trực BC và trung tuyến xuất phát từ C có phương trình lần lượt là: (d1): x+y-3 = 0; (d2):2x – y – 1= 0. Giải chị tiết nha. (Ở đây thấy tam giác ABC cân tại A vì A thuộc d1)

Giúp em ạ Trong bài có những chữ viết tắt như HLP(hình lập phương ) , Stp ( diện tích toàn phần ) , Sxq ( diện tích xung quanh )

Cho điểm I trong đường tròn tâm O hai dây cung AC và BD cùng đi qua điểm I sao cho IO là tia phân giác của góc AIB vẽ OH vuông góc với AC tại H, Ok vuông góc với BD tại K .chứng mik a, AC =BD b, sđAD=sđBC và cm tứ giác ABCD là hình thang cân c,OI vuông góc với AB

Mark A, B, C or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions 1. A. bear B. pear C. dear D. chair 2. A. sure B. future C. picture D. adventure Mark A, B, C or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions. 3. A. maintain B. marine C. challenge D. device 4. A. carnivore B. entrapment C. technology D. Atlantic

Đốt cháy hoàn toàn 5,6 lít đkc hỗn hợp hidrocacbon mạch hở cùng dãy đồng đẳng liên tiếp. Sản phẩm cháy được hấp thụ hết vào bình đựng dung dịch Ba(OH)2 dư thấy 108,35 gam kết tủa và khối lượng dung dịch này giảm 74,25 g. Tính %V của hai hidrocacbon trong X

Cho a ³+b ³+c ³=3abc và a+b+c khác 0 Tính N = $\frac{a^2+b^2+c^2}{(a+b+c)^2}$

Cảm nhận về vẻ đẹp bức tranh thiên nhiên ,cảnh sinh hoạt và nhân vật mị trong đoạn "trên đầu núi.......ngày đêm đã thổi sáo đi theo mị" từ đó nhận xét chất thơ trong sáng tác của nhà văn tô hoài

Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning of the underlined word(s) in each of the following questions. 5. Sperm whale population is at risk due to hunting. A. in extinction B. in danger C. on the decrease D. in fewness 6. If modern technology did not exist, we would never have such precious information. A. valuable B. precise C. confidential D. detailed Mark the letter A, B, C or D on your answer sheet to indicate the word(s) OPPOSITE in meaning of the underlined word(s) in each of the following questions. 7. For centuries, people have been challenged by the mysteries that lie beneath the blue depths of the ocean. A. overhead B. top C. over D. high 8. Keep only fish that you will eat; release the rest. A. catch B. hold C. take D. have Mark A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. 9. Oh, luckily the thieves didn’t break into our house last night. You_______have opened the back door all night. A. should B. shouldn’t C. must D. mustn’t 10. ___________ interested in that subject, I would try to learn more about it. A. If I am B. Should I C. I was D. Were I 11. I really think you_______go and see the doctor, you look very tired. A. would B. should C. will D. need 12. My friends usually walk to school if they _______enough time. A. have B. had C. have had D. will have 13. The UK is divided ______four parts: English, Scotland, Wales and Northern Ireland A. into B. between C. for D. among 14. Although insects are harmful to plants, their existence contributes a great part _______ biodiversity which helps to make a balanced environment. A. to B. for C. with D. at 15. Reducing the gap between rich and poor is one of the main______ facing the government. A. challenging B. challenges C. challenger D. challenge 16. The article was an excellent piece of __________journalism. A. investigate B. investigative C. investigation D. investigating 17. The seabed ____________here to 500 meters. A. deepens B. deep C. dept D. deeper 18. The authority supplied the victims of the fire _________food, clothes, and money. A. on B. for C. to D. with 19. What would you do if you______by a snake? A. are bitten B. had been bitten C. were bitten D. has been bitten 20. Glenda _________ extremely hard when she was a student. A. worked B. has worked C. was working D. had been worked ÔN TẬP TIẾNG ANH TIẾT 2 Mark A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. 21. Unless we (A) worked (B) harder, we would (C) finish on (D) time. 22. If (A) Europe fails to agree (B) on this, we can tell (C) goodbye to any common (D) foreign policy. 23. Despite (A) my feet were killing me (B) and my head (C) was pounding. I finished running the marathon (D). 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. 24. Nam and Tung are talking about the health of the ocean. Nam: The sea is getting polluted because beaches are filled with plastic bags, pieces of glass and cigarette butts . Do you think so? Tung: _______________. This is really worrying. A. I don’t think so. B. I’ll think about that. C. I don’t agree. D. Yes, I also think so.

Tên gọi sản phẩm sau khi đúc , giải thích hiện tượng

Cho abc = 2 Rút gọn A = $\frac{a}{ab+a+2}$ + $\frac{b}{bc+b+1}$ +$\frac{2c}{ac+2c+2}$