Cho Δ ABC cân tại A, có BC = 2a. M là trung điểm của BC. Lấy D,E theo thứ tự thuộc các cạnh AB,AC sao cho góc DME = góc B a) Chứng minh tích BD.CE không đổi. b) Chứng minh DM là phân giác góc BDE. c) Tính chu vi Δ AED nếu Δ ACB đều. Mọi người giúp em với ạ T^T

ý nghĩa cuộc khởi nghĩa hai bà trưng

cho so 1377x hay tim chu so thich hop thay vaox de chia het cho 2359

Nêu nguyên nhân bùng nổ chiến tranh thế giới lần 2

Một người đi bộ đều trên quãng đường đầu dài 3km với vận tốc 2m/s. Ở quãng đường sau dài 1,95km người đó đi hết 0.5 giờ. Tính vận tốc trung bình của người đó trên mỗi quãng đường và cả hai quãng đường

làm giúp mk vs mk đang cần gấp lắm

1. The baby_____ his food onto the floor and making his mother angry. A. always threw B. is always throwing C. has always thrown D. always throws 2. I would like_____to Africa. A. go B. to go C. going D. to going 3. ____ is a building or room where people can go to look at paintings. A. Gallery B. Library C. University D. Gym 4. I brought back this cowboy hat as a ______ of America. A. gift B. present C. award D. souvenir 5. While Angela was cleaning her room, she _____ her lost earring. A. is finding B. finds C. has found D. found 6. Why don’t you come _____ for dinner? A. about B. over C. up D. upon 7. I picked up a copy of their summer travel_____. A. paper B. magazine C. book D. brochure 8. _____ is hot liquid rock that comes out of a volcano. A. Limestone B. Marble C. Lava D. Ice 9. We went_____ a 10-day tour of central Africa. A. in B. on C. at D. from 10. As Bob was driving to work, he _____ a wonderful idea. A. has B. has had C. had D. was having 11. The tour______ a visit to the Science Museum. A. had B. included C. enclosed D. included of 12. The statue_____ out of stone. A. carves b. was carved C. paints D. was painted 13. Ann ________ television when the phone rang. A. watches B. watched C. has watched D. was watching 14. Mary: ‘I think I’ll stay here after all.’- Peter: ‘You ______your mind.’ A. always change B. has always changed C. always changed D. are always changing 15. Oil poured_____ of the damaged ship. A. out B.off C. over D. upon 16. Jack _____ his homework between 8 pm and 9 pm. A. did B. was doing C. made D. was making 17. ____ is an area of land between hills or mountains. A. Valley B. Beach C. Bay D. Island 18. Tom burnt his hand when he _____ the dinner. A. cooked B. was cooking C. has cooked D. cooks 19. Peter: ‘I can’t read this.’- Mary: “You _____ about my handwriting.” A. always complain B. has always complained C. always complained D. are always complaining 20. A cup of tea sounds______. A. perfect B. perfectly C. perfection D. perfectionist

Put the verb in brackets in present perfect or simple past tense 14/ Mr Brown (work) as a factory worker for 40 years then he (retire) and go to live in the country last year. 15/ Where’s your umbrella? I don’t know. Someone (take) it. 16/ Your house looks very new. You (paint) it? 17/ The weather (be) very cold in the morning recently. 18/ Yesterday I (be) very busy so I (not read) any newspapers. 19/ Do you know her? Yes, we (know) each other for a long time. 20/ They (build) this hotel since last year. They (not finish) yet. Giúp mình với

Một mảnh đất hình chữ nhật có chiều dài 112m, rộng 40m. Người ta chia mảnh đất thành các ô vuông bằng nhau đẻ trồng các loại rau. Hỏi cạnh mỗi ô vuông lớn là bao nhiêu mét? Với cách tính đó, diện tích của mỗi ô vuông và số ô vuông chia đc

Mn ơi làm bài 2 giúp mk với nếu đúng mk tove cho 5 sao luân ạ