Kết quả của A : $\frac{1}{2x6}$ + $\frac{1}{6x10}$ + $\frac{1}{10x14}$ + ... + $\frac{1}{2022x2026}$ là bao nhiêu ( x là nhân )

mọi người giúp em bài này với ạ

Tính 1+2+3+...+1999 Giúp mình với

Exercise 1. Rewrite the following sentences in reported speech with infinitives. 39. “Don’t forget to send your uncle a birthday card tomorrow,” Mary said to her son. Mary reminded ...…………………………………………………………...................................................... 40. “Please come to our wedding,” John said to his boss. John invited …………………………………………….................................................................................. 41. “Don’t run around the edge of the swimming pool or you’ll fall in,” Susan said to her children. Susan warned ………………………………………………………............................................................... 42. “I won’t go to bed,” Ron said. Ron refused ……………………………………………….............................................................................. 43. “You should talk to your advisor,” Bill said to Linda. Bill advised ……………...…………………………....................................................................................... 44. “Take that chewing gum out of your mouth immediately!” the teacher said to Tom. The teacher ordered ……………………………………………………………….......................................... 45. “ I will bring the sandwiches to the party,” said Helen. Helen offered ................................................................................................................................................... 52. “Come to the cinema with me tonight,” he said to her. He invited ……...……………………………………….................................................................................. 53. The teacher said to us , “Do all your homework before you go to class” The teacher told ..……………………………………….................................................................................. 54. Mary said to Tom, “Send me a postcard when you come to Paris, please” Mary asked ....................................................................................................................................................... 55. He said to me, “Don’t believe everything you hear” He advised ..……………...…………………………....................................................................................... 56. James said to her boyfriend, “Come with me tonight. I’m feeling very lonely” James begged .…………...…………………………....................................................................................... 57. “Follow this car,” the detective said to the taxi-driver. The detective ordered ....................................................................................................................................... 58. “Go on, send your short story to magazine,” Adam said to Alice Adam encouraged ............................................................................................................................................ 59. The teacher said to Jim, “Would you give your book to Mary, please?” The teacher asked ............................................................................................................................................. 60. “Ok. I will not change the date of the meeting,” Mary said Mary promised .................................................................................................................................................

cho tam giác ABC vuông tại B có AB=15cm, AC=20cm, đường cao AH, đường phân giác DB(h thuộc BC; D thuộc AC) a) c/m tg ABC đồng dạng tg HBA, từ đó suy ra AH.BC=AC.AB b) tính độ dài các đoạn thẳng BC, AH, BH, c) gọi I là giao của AH và BD, tìm tỉ số S tgABD/S tgHBI d trên cạnh AB lấy điểm M, trên cạnh AC lấy điểm N sao cho BM=CN, gọi K là giao điểm của MN và BC. c/m AB/AC=KN=KM mk đg cần gấp ạ!!

8 người làm 500 sản phẩm hết 4 giờ. Hỏi cũng năng suất ấy thì 16 người làm 1000 sản phẩm hết bao lâu?

Vẽ Miki (Shugo Chara) + trong bức vẽ kí là @Mihh

I.Choose the best answer 1. _______ he is old, he wants to travel around the world. A. In spite of B. Although C. Despite D. Because 2. ________ I came to England, I couldn’t speak a work of English. A. Since B. After C. While D. Before 3. They left the house ________ saying good-bye to their mother. A. before B. after C. during D. in 4. She is looking for a new job _______ she is tired of doing a routine job day after day. A. despite B. although C. because D. All are correct 5. He’s still going to school _________ his injury. A. even though B. although C. in spite of D. even though 6. He left home early ________ he could arrive at the station on time. A. because of B. in order to C. although D. so that 7. We will wait here ______ he comes back. A. while B. until C. before D. after 8. We could reach the house ______ the road was flooded. A. although B. whether C. as if D. even 9. My mother looks _______ she is tired. Perhaps she didn’t sleep well last night. A. like B. although C. until D. as if 10. Our teacher speaks slowly _______ we may understand him. A. because B. in order to C. so that D. or 11. ________ these cars are cheap, they last a long time. A. Because B. in order that C. Although D. after 12. You should give the iron time to heat up _______ you iron your clothes. A. because B. so that C. even though D. before 13. You need good shoes to go hiking in the mountains _______ the ground is rough and hard. A. because B. so that C. before D. even though 14. ________ he is tired, he can’t work longer. A. Because B. Even though C. Although D. Beside 15. ______ he is so busy with his work, he always finds time to go to the concert every week. A. If B. Since C. Although D. Because 16. I haven’t seen Tom _____ he gave me this book. A. since B. for C. until D. Before 17. He had left _____ I came. A. when B. while C. since D. by the time 18. Our visit to Japan was delayed _____ my wife’s illness. A. because B. because of C. thanks to D. Though 19. I couldn’t unlock it ______ I had the wrong key. A. because B. so that C. although D. so 20. ______ rain or snow, there are always more than fifty thousand fans at the football games. A. Despite B. Although C. Because D. Since

Tìm m để hbpt $\left \{ {{x^{2}-2x+1-m\leq0} \atop {x^{2}-(2m+1)x+m^{2}+m\leq0}} \right.$ có nghiệm

cho mik hỏi ND CỦA BÀI VĂN NÀY LÀ J