Cho tam giác nhọn ABC có AB > AC, vẽ đường cao AH. a. Chứng minh HB > HC b. So sánh góc BAH và góc CAH. c. Vẽ M, N sao cho AB, AC lần lượt là trung trực của các đoạn thẳng HM, HN. Chứng minh tam giác MAN là tam giác cân.

Có 1 câu trắc nghiệm thôi ạ nma các bạn giải thích giúp mình vì sao chọn câu đó nhé (dịch được càng tốt ạ) ĐỀ BÀI dạng kết hợp câu

Hihihiihi, ai nhanh thì đựt nhó

Cho ∆ ABC vuông tại A có BD là phân giác, kẻ DE ⊥ BC ( E ∈ BC ). Gọi F là giao điểm của AB và DE. Chứng minh rằng: a) BD là trung trực của AE b) DF = DC c) AD < DC; d) AE // FC.

hai xí nghiệp cùng may một loại áo. xí nghiệp thứ nhất may 1600 cái và xí nghiệp thứ 2 may 1020 cái . biết trong một ngày xí nghiệp thứ 2 may nhiều hơn xí nghiệp thứ nhất 20 cái và xí nghiệp thứ 2 hoàn thành sóm hơn xí nghiệp 1 2 ngày . hỏi mỗi xí nghiệp trong một ngày may đc bao nhiêu cái áo. mn giải bài này giúp mình

Tính : 6:2(1+2) NL: Ko bt là lớp mấy nên chọn bừa lớp 3

Reported speech. offered, invited, asked, suggested, said 1. “Would you like to eat out with me?” Jane said to me. - Jane __________________________. 2. Jim said to Nga, “Can I carry it for you?” - Jim ______________________. 3. “Why don’t we join the meeting?” Jack said. - Jack __________________________. 4. “Please sweep the floor, Peter? I have to do the cooking,” said Mary. - Mary _________________________________ 5.“Did you meet Tim yesterday, Linda?” Kevin said. - Kevin __________________________________ Comparison 1. This car is cheaper than that one. - That car isn’t __________________. 2. This movie is more interesting than that one. - That movie isn’t_______________________. 3. Jane speaks Vietnamese more fluently than Jack. - Jack doesn’t __________________________ _______. 4. No one ran as fast as than Kevin. - Kevin ________________________________ 5. No student works as hard as Tim. - Tim is the student ________________________ Multiple choice 1. He has to narrow the trip down although / because / so he is enjoying it very much. 2. The table which / who / whose leg was broken has been repaired. 3. We should never cause / force / make others feel pessimistic. 4. Peter adores travelling, isn't he / doesn't he / didn’t he? 5. Jack said / wondered / told why the meeting had been cancelled. 6. They eat with their eyes, so you should marinate / garnish / purée the dishes. 7. I always remember the time which / where / when we spent together at that summer camp. 8. These plants will die if / unless/ although it rains. Gap fill 1. Jack never tells lies, _______he? 2. Michael Jackson was famous _______his performing style. 3. Jim doesn’t like rap music and I don’t_________. 4. Jane _______him if he would join the meeting. 5. I am very excited _______the coming game show on TV. 6. Tom isn’t satisfied with the test result and I’m not ________. 7. She _______mentioned you and your performance lately. 8. I’d like to buy a _______of lettuce, not a stick of celery. 9. _______the good meal, she didn’t eat anything. 10. Some students play games too much; ________, their study results are so bad. 11. She is fond of novels; ________, she has little time to read them. 12. That house is much _______comfortable than this one. Prepositions 1. My mother doesn’t allow me to go out alone ____night. 2. The weather is cold _____winter. 3. Your tablet is almost similar ______mine. 4. AI stands _______Artificial Intelligence. 5. I was born ______June, 2005. 6. The color of this car is quite different _____that of my car. 7. Air pollution results _______health problems. 8. He left for Ha noi _______June, 2nd, 2021. 9. I live ______54, Ngo Quyen Street. 10. _____a winter night, my grandma told me a story about Cinderella. 11. Tim got ______the bus and it began to run. 12. Do you have to look ______the house while your pảents are away? Transformation 1. No student can work out this math except Peter. - Peter is _______________________________________ 2. I have never read this book before. - This is ___________________________ 3. We couldn’t go out because of the strong storm. - The strong storm ________________________ 4. It is five years since we last met. - We _______________________. 5. We are trying our best in order to pass the coming entrance exam. - We are trying our best so that ______________________ 6. I am very excited about seeing her. - I can’t ______________ Word form 1. (geology). I’d like to know something about the _________ features of Viet Nam. 2. (recognise). Ha Long Bay gained UNESCO’s ____________of its natural beauty. 3. (locate). Can you tell me where Ponaga Cham Towers are _____________? 4. (picture). It is said Huong Pagoda is _____________. 5. (astound). The number of people attending the festival is ____________. Ask questions 1. Jack leaves for school at 6.30. 2. Kevin posted an article on the website. 3. Tim went to the supermarket to buy some food. 4. Jim is fond of story books. 5. Peter is in grade 9. 6. We must obey the traffic rules. 7. Jack drew this picture two weeks ago. giúp em với

giải hộ em 2 câu trắc nghiệm v ạ

QUESTIONS 16-20Complete the conversation.What does David say to the waiter?For questions 16-20, mark the correct letter A-H on the answer shee t Waiter: Good evening, sir. How can I help you? David: 0 ......... B Waiter: Certainly, sir. This one by thewindow? David: 16 .............. Waiter: And what would you like to eat? David: 17 ........ ................ Waiter: Spaghetti with meat and tomatosauce is very nice, or there is fourcheesepizza. David: 18 ........ ...... Waiter Fine. And would you like anything with it? Garlic bread or ... David: 19 .............. Waiter: OK. And to drink? David: 20 ...... ........ Waiter: Yes, certainly. So that’s one fourcheesepizza, one green salad andone mineral water. Thank you, sir. A Have you got mineralwater? b Good evening. I'd like atable for one. C How much is it? D What have you got? E I think I’ll have the pizza. F Can you bring me themenu, please? G Nothing more, thanks. Ohyes, perhaps a green salad. H Yes, that’s fine. giúp mik với

Find out the mistake and fix it. 1. Students sometimes like to have picnic. ................................................................................................... 2. Mr Brown always goes to work in car. ................................................................................................... 3. Can you tell me the way to hospital ? ................................................................................................... 4. There are a dog under the table. ................................................................................................... giúp mik với các b ơi