Cho tam giác ABC vuông ở A, phân giác BD. Kẻ DE vuông góc BC (E thuộc BC). Trên tia đối của tia AB lấy điểm F sao cho AF = CE. Chứng minh rằng: 1. Cho BC= 15cm, AB= 9cm. Tính độ dài cạnh AC. 2. BD là đường trung trực của AE 3. AD < DC. 4. Gọi M là trung điểm FC. Chứng minh: B, D, M thẳng hàng

Phân tích đa thức thành nhân tử x^2+x+1

Vẽ 5 con đậu mầm chồng lên nhau nha '-' Full line full màu

Yêu cầu: Tính tổng S = 22 + 42 + ... + (2n)2. Dữ liệu: Cho 1 số nguyên dương n (n<=10^6). Kết quả: Tổng S. Ví dụ input 2 output 20 Ai code giúp mình bài này với ngôn ngữ C++ nha

I. Read the text below and think of the word which best fits each space. Use only ONE word in each space. (15 points) A POP STAR John Lennon was (0)born in Liverpool in 1940. He was always (1).................................on music and played in a pop group (2) ........................................ school and Art college . John (3).................................. married to Cynthia in 1962 and they had a son (4)............................... name was Julian. At that time, John was a member of a group (5)................................“ The Beatles” . Many beautiful songs (6) .................................. written by John and wherever the group went, crowds of fans gathered to see them . They (7).................................... scream and faint when “ The Beatles” played and lots of people have their hair cut in a Beatles style. Soon, everyone had heard (8)..................................... “The Beatles” and John was (9).............................. richer than he had ever thought. Having achieved world-wide success, John started to make records (10)................................. his own after 1968 , and it was in the same year when (11).................................... marriage to Cynthia came to an end. He had met Yoko Ono (12).......................... he married the following year. John lost weight and grew his hair long , as can (13) ................................ seen on the covers of the records that he made with Yoko. He set up home in the United States and had a son called Sean. Many people considered John Lennon to be (14) ............................... most talented of all “The Beatles”. He sang about peace and love and so when he was murdered by one of his fans, outside his New York apartment , the whole world (15).................................... shocked . More than 50,000 fans turned up to a ceremony in his memory. He was only forty when he died. II. Complete the second sentence so that it has the similar meaning to the first sentence using the word given. Do not change the word given. ( 10 points) 1. Could you possibly help me with this box? mind Would …………………………………………………………………………….................... 2. “Who ate the cake?” she asked. had She wanted...………………………………………………………………....….................... 3. What sort of weather did you have on holiday? like What ……………………………………………………………………….……..................... 4. I am not good at skiing, but I’d like to learn. not I do…………………………………………………………………………….......................... 5. The exam wasn’t as hard as I expected. than The exam………………………………………………………………………….................. 6. Don’t forget to contact me if you come to London. touch Don’t forget to…………………………………………………………………………........…. 7. Make sure that you don’t arrive late. turn Make sure that…………………………………………………………………………........… 8. Your English will improve if you keep practising. get Your English…………………………………………………………………………...........… 9. Normally I have a ten-minute journey to school. me Normally………………………………………………………………………….................… 10. She is keen on meeting people from other countries. who She wants………………………………………………………………………….............….

cho hình vuông ABCD và điểm H thuộc BC ( H ko trùng B và C ). Trên nửa mặt phẳng bờ là BC ko chứa hình vuông ABCD , dựng hình vuông CHIK a) chứng minh DH vuông góc Bk b) gọi M là giao điểm của DH và BK, N là giao điểm KH và BD. chứng minh DN.BD+ KN.BK=DK^2 c)chứng minh BH/HC + DH/HM + KH/HN > 6 hứa 5 sao + cảm ơn ạ

Giải hộ mình câu 2 Mới đầu hỏi có dì mn thông cảm

có 1 Pa răng gồm ròng rọc cố định và 1 ròng rọc động để đưa 1 vật có khối lượng 120kg, lên cao 9m a, vẽ sơ đồ thiết bị b, lưc sinh ra và đoạn dây phải kéo là? c, dùng hệ thống máy cơ này có ý nghĩa gì?

Giúp mình nha mọi người !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Giúp mình giải 2 phương trình này vs ạ