tim tat ca uoc va boi cua : -5 ; 12

cho tam giác ABC có AB<AC và AD là phân giác. Trên nửa mp bờ BC không chứa A vẽ tia Cx sao cho góc BCx=góc BAD,Cx cắt tia AD ở E. Kẻ EH vuông góc với AC tại H. Lấy điểm I đối xứng với C qua EH. Chứng minh :a)∆DAB~∆DCE ,b)∆ECB là tam giác cân, c)AD.AD=AB.AC-BD.DC,d) I,B đối xứng nhau qua AE

Cho đường tròn tâm O đường kính AB,CD là đường kính thay đổi của (O) khác AB. Tiếp tuyến của (O) tại B cắt AC,AD tại N,M.Chứng minh tứ giác CDMN nội tiếp

em đang cần ạ mn làm rồi vì sao lại trọn đáp án đó ạ hứa cho 5 sao

Hộ mk câu 1 2 tl với trình bày luôn nha

Mik cần gấp Bn nào bt giải giúp mik ik ạ

1. we should take a shower instead of bath to..........water. A waste B save C make D use 2. Hung is good driver. He always drivers..........( giải thích ) A careless B carelessly C carefuly D careful 3. Choose the word which has underlined part pronounced different from the others: A help B wash C laugh D need 4. if your brother ............. harder in learning he will easily pass the exam. A will try B tried C try D tries

Nêu những chi tiết miêu tả cử chỉ, tư thế, hành động của Bác trong đêm không ngủ trong bài thơ Đêm nay Bác không ngủ của Minh Huệ.

Sốc các bn: hãy chứng minh 4÷3=2

1. In most of the __________________ companies, employees are required to use English competently. (NATION) 2. He has completed three English courses at this center, but there hasn’t been any __________________ in his English level. (IMPROVE) 3. It is a __________________ that students must have at least 6.0 IELTS to take part in that English speaking contest. (REQUIRE) 4. She prefers a book written only in English to a _________ one. (LINGUAL) 5. She __________________ the word, so her foreign friend couldn’t understand what she meant. (PRONOUNCE) 6. Excessive consumption of fast food increases the risk of ____________. (OBESE) 7. People who are interested in exploring new things always want to take _________ trips. (ADVENTURE) 8. If you are going to Son Doong Cave, you really need to book a __________________ tour because you will easily get lost there. (GUIDE) 9. In some Asian countries such as India, Pakistan, the Philippines and Singapore, English is used as the __________________ language. (OFFICE) 10. The variety of dialects and accents in English is one of the biggest challenges to _______ English speakers. (NATIVE) 11. Oranges, sunflower seeds and salmon are believed to support blood __________in our body. (CIRCULATE) 12. Although canned food is convenient, it is not good for your health because it contains __________________. (PRESERVE) 13. Most of visitors can’t help being amazed by the __________________ of Edinburgh Castle. (MAGNIFY) 14.The heavy rains cause river levels to rise and make the cave largely ____________. (ACCESS) 15.My English teacher told me that some sentences in my essays were not ___________ correct. (GRAMMAR) 16. English has grown from a language of few speakers to become the dominant language of international __________________ . (COMMUNICATE) 17. Until the 1600s, English was, for the most part,__________________ only in England and had not extended even as far as Wales, Scotland, or Ireland. (SPEAK) 18. English began to spread around the globes as a result of __________________ , trade (including slave trade), colonization, and missionary work. (EXPLORE) 19. Thus, small enclaves of English speakers became established and grew in __________________ parts of the world. (VARY) 20. Two-thirds of the world’s science writing is in English, and English is the main language of technology,__________________, media, international airports, and air traffic controllers. (ADVERTISE) 60 điểm GIÚP VỚIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII