Cho ΔABC có 3 góc nhọn, kẻ BM ⊥ AC, CN ⊥ AB ( M ∈ AC, N ∈ AB) H là giao điểm của BM và CN O là trung điểm của BC trên tia đối của tia OH lấy điểm D sao cho O là trung điểm của HD Trên đoạn thẳng BH và CD lấy các điểm E và F, BE = CF a, CM: Δ OCH = Δ OBD từ đó suy ra: BD ⊥ AB b, CM: 3 đoạn thẳng BC, HD, EF đi qua cùng 1 điểm

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions from 18 to 20. Question 18: "What will you do if you have ten days off school?" he asked. A. He asked me what will I do if I have ten days off school./ B. He asked me what I would do if I had ten days off school. C. He asked what would I do if I had ten days off school. D. He asked what I will do if I have ten days off school. Duestion 19: They say that Reagan was an actor years ago. A. Reagan is said to have been an actor years ago. C. Reagan was said being an actor years ago. go. Puestion 20: He can't do the test because it is too difficult. A. If the test isn't too difficult, he can do it. C. If the test hadn't been too difficult, he could do it. D. If the test weren't so difficult, he can do it. B. Reagan is said to being an actor years ago. D. Reagan was said having been an actor years B. If the test weren't so difficult, he could do it. ead the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the orrect word or phrase that best fits each of the numbered blanks from 21 to 25. Ron

giải giúp em câu này với ạ. em cám ơn nhiềuuu

Giúp mình với ạ mình cảm ơn nhiều ❤️

Có 3ADN tự nhân đôi 5lần thì tạo ra mày ADN Giúp em với mai em thi rồi huhuhu 😭

giúp mình với ạ <3 cảm ơn nhiều

cần phải có chế độ dinh dưỡng như thế nào cho hợp lý?

chứng minh C=5^1+5^2+5^3+5^4+...+5^2010 chia hết cho 6 và 31

Hãy ghi lại chính xác 2 câu thơ trong một bài thơ (khác ánh trăng), ở chương trình THCS có sử dụng biện pháp so sánh và nhân hóa, nêu tác giả và tên bài thơ?

read the passage , then decide if the statements that follow are Tru of False Da Nang is one of the most peaceful cities in Viet Nam with a lot of beautiful beaches. This is a wonderful place for those who love seas and enjoy fresh air. Life here is not so busy as that in Ho Chi Minh City. It is not only a beautiful city but also a safe place to live in. Every evening, after work, you can easily catch the sight of families riding to the beach, leaving their motorbikes on the seaside and jumping into the water. They are not afraid of losing their motorbikes. They believe that their vehicles will still be there when they come back. There is no beggar here and the air is fresh. Another good thing is the food. If you love seafood, Da Nang will be the right choice. The food here is very fresh and the price in cheaper than that in Ho Chi Minh City. 1 . Da Nang is the most beautiful place in Viet Nam _________ 2. Life in Ho Chi Minh is busier than life here ________ 3. Every morning you cannot catch the sight of families riding to the beach ________ 4. The food in Ho Chi Minh City is very fresh and more expensive than Dan Nang ________