Bài 4. Cho tam giác ABC cân tại A có AB = AC = 34cm , BC = 32cm . Kẻ đường trung tuyến AM . a) Chứng minh AM ⊥ BC . b) Tính độ dài AM . c) Tinh chu vi và diện tích tam giác AMB . Bài 5. Cho tam giác ABC vuông tại A , đường trung tuyến AD . Trên tia AD lấy điểm E sao cho D là trung điểm của AE . Chứng minh rằng: a) AC//BE. b) AD= 12BC.

Chứng minh rằng nếu một tam giác vuông có một góc nhọn bằng 30 độ thì cạnh góc vuông đối diện với nó bằng nửa cạnh huyền.

1. Mark letter A, B, C or D on your answer sheet to indicate the best sentence that can be made from the cues given. engine/ car/ need/ clean/ once/ month/. A: The engine of the car needs cleaning once a month. B: The engine for the car need to clean once a month. C: The engine with the car needs to be cleaned once a month. D: The engine of the car needs to clean once a month. 2. Mark letter 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. A: habit B: delighted C: music D: pressure 3. Mark letter A, B, D or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. I prefer talking face to face to talking in the phone. A: talking B: face to face C: to D: in 4. Mark letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to the original sentence in each of the following questions. Ian didn’t know how to water-ski, but he tried to do it. A: Although Ian tried hard, he didn’t know how to water-ski. B: Although Ian didn’t know how to water-ski, he tried to do it. C: Ian didn’t water-ski because he didn’t know how to. D: Ian didn’t try to water –ski because he didn’t know how to do it. 5. Mark letter A, B, C or D on your answer sheet to indicate the best sentence that can be made from the cues given. many/ place/ the world/,/ people/ used/ dye/ cloth/ nature/ material/. A: In many places in the world, people used to dye cloth with nature materials. B: In many places in the world, people used to dyeing cloth by natural materials. C: In many places in the world, people used to dye cloth with natural materials. D: In many places in the world, people used dyeing cloth by natural materials. 6. Mark letter 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. A: stress B: relaxed C: event D: helpline 7. Mark letter 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. A: confident B: cognitive C: face D: creative 8. Mark letter A, B, D or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. Minh is interested in basketball, but he isn’t enough tall. A: is B: in C: basketball D: enough tall 9. Mark letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. I used ________________ to school but now I cycle to school. A: walk B: walking C: to walking D: to walk 10. Mark letter 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. A: behave B: wonderful C: prepare D: tradition 11. Mark letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. The Internet is a vast _______________ of computers, all connected together. A: supply B: resource C: network D: discovery

Có 1 hỗn hợp gồm 3 kim loại ở dạng bột. Fe, Cu, Au. Bằng phương pháp hóa học hãy tách riêng từng kim loại ra khỏi hỗn hợp

Giúp mik bài 8;11 vs, mik cảm ơn Chỉ bài 8;11 thui nha

Em hiểu gì về vi rút covid 19 , nêu cách phòng bênh covid .19 tốt nhất hiện nay

2. Don’t you want to see this programme? It ………….(start). A.starts B.has started C.have started D.started Mục khác: 7. ………you ever (eat)………….. Sushi? * A.Have/ eaten B.Have/ eated C.Do/ate D.are/ eating giúp mk vs mk cần gấp

viết công thức động từ thường / tobe / quá khứ đơn / hiện tại đơn / tương lai đơn nhanh lên ko cần ví dụ đâu công thức thôi ko chép mạng

Bài tập bộ trợ tuần 28 : Đêm nay bác ko ngủ

1Thưcj hiện phép tính(tính nhanh nếu có thể) 7/6+-5/4 3/4- -2/3 2 tìm x X+1/3=2/4