Hai thùng có tất cả 120 lít dầu .đổ từ thùng thứ1 sang thùng 2 số lít dầu ở thùng 2.Sau đó đổ từ thùng 2 sang thùng 1 số lít dầu bằng số dầu đang có ở thùng 1 thì số dầu ở hai thùng bằng nhau.Tính số lít dầu lúc ban đầu

Giúp mình với !! Mình hứa sẽ cho 5*

Mn ơi giúp m với Bán bao nhiêu chiếc và giao bao nhiêu chiếc

Cho tam giác DEF cân tại D, các đường cao EN và EM cắt nhau tại H. a) Chứng minh tứ giác EMNF là hình thang cân. b) Chứng minh tam giác DMH = tam giác DNH. c) Chứng minh DH vuông góc NH

Cách lưu khoá học trên mạng vào drive (trên máy tính nhé ạ)

Anh/chị có đồng ý với ý kiến "có những vẻ đẹp không thể ghi lại bằng máy ảnh mà chỉ có thể ghi lại bằng ký ức và cảm xúc" không? Vì sao?

1.She wishes she ……………. the window last night. (open) (1 Point) Enter your answer 2.They wish we ……………. them some food yesterday. (give) (1 Point) Enter your answer 3.I wish that he ……………. us next year. (visit) (1 Point) Enter your answer 4.The boy wishes that he ……………. the competition the next day. (win) (1 Point) Enter your answer 5.She wishes that she ……………. at home now. (be) (1 Point) Enter your answer 6.It would be nice to stay here. I wish we ______________go now. (not have to) (1 Point) Enter your answer 7.The oldest house in the USA _______________ in 1624. (1 Point) is built are built were built was built 8.Sugar and tobacco _______________ on large fields in Brazil. (1 Point) is grown are grown was grown were grown 9.The windows _______________ by the girls now. (1 Point) is being cleaned are being cleaned was being cleaned were being cleaned 10.She has just found her cat in the garden. (1 Point) Her cat has just found by her in the garden. Her cat has just been found by her in the garden. Her cat was just found by her in the garden. Her cat have just been found by her in the garden. 11.They had painted the house before they moved away. (1 Point) The house had been painted before they moved away. The house had painted before they moved away. The house had being painted before they moved away. The house has been painted before they moved away. 12.His brother was telling him to calm down. (1 Point) He is being told to calm down by his brother. He was being told to calm down by his brother. He is told to calm down by his brother. He has been told to calm down by his brother. 13.This city will surprise you. You ________________ by this city. (1 Point) are surprised will be surprised will have been surprised will surprise 14.You must give students enough time to finish. (1 Point) Students must be giving enough time to finish. Students must be given enough time to finish. Students must give enough time to finish. Students must have been given enough time to finish. 15.You should finish the work before you leave. (1 Point) The work should be finished before you leave. The work should be finishing before you leave. The work should finished before you leave. The work should have been finished before you leave. 16.The students say that the exam wasn't easy. --> The exam ___________________________________ (1 Point) Enter your answer 17.They claim that we remember things we hear in our sleep. --> It _____________________________________________________ (1 Point) Enter your answer 18.People believed that Anna stole the money. -->Anna ______________________________________ (1 Point) Enter your answer 19.I couldn't sleep so I tried ______________(drink) some hot milk. (1 Point) Enter your answer 20.She tried ____________(reach) the book on the high shelf but she was too small. (1 Point) Enter your answer 21.She delayed __________(get) out of bed. (1 Point) Enter your answer 22.He demanded ________________(speak) to the manager. (1 Point) Enter your answer 23. I'd hate ____________(arrive) too late. (1 Point) Enter your answer 24. She admitted ___________________(steal) the money. (1 Point) Enter your answer 25.If I ………….….a lot of money now, I …………..a new car. (1 Point) have/ will buy have/ would buy had/ will buy had/ would buy. 26.They would be disappointed if we…………………………………. (1 Point) hadn’t come wouldn’t come don’t come didn’t come 27.If I get up early in the morning, I _________go to school on time. (1 Point) would could will am 28.I will go there if you don't call me. --> Unless______________________ (1 Point) Enter your answer 29.Unless she works hard, she won't get a promotion. -->If_______________ hard, she won't get a promotion. (1 Point) Enter your answer 30.People who live in a cold country don't like hot weather. --> If you live ______________________________________ (1 Point) Enter your answer

COn tàu titanic chìm vào lúc nào???

13. Ba ____________his room yesterday afternoon. A. tidied B. were tidying C. will tidy D. tidies 14. What ____________ yesterday at 10.20 pm? A. are you doing B. was you doing C. were you doing D. did you do 15. When I ____________you last night, what you ____________? A. see/ did you do B. saw/ are you doing C. saw/ were you doing D. was seeing/ did you do 16. My father ____________us to go out in the boat before he came home yesterday. A. didn’t allow B. hadn’t allowed C. doesn’t allow D. hasn’t allowed 17. Since the boys broke a window, they____________ very nervous. A. are feeling B. have felt C. had felt D. felt 18. Mr. John____________ to Los Angeles in 1992. A. had gone B. has gone C. went D. was going 19. While I was going to school yesterday, I____________ him. A. am meeting B. met C. will meet D. meet 20. I ____________ about him when suddenly he came in the room. A. talk B. talked C. am talking D. was talking 21. It began to rain when they ________________basket ball. A. play B. are playing C. were playing D. is playing 22. He ______ email before, so I ______ him how to use it. A. did not use / had shown B. had not used / showed B. has not used / showed D. was not using / will show 23. As soon as you __________ your homework, you will be allowed to go out. A. are doing B. had done C. have done D. did 24. Don’t come ____________ I have finished lunch. A. after B. as soon as C. since D. until 25. By the time I ________ the party last night, David _________. A. arrived/ had left B. arrive/ will have left C. had arrived/ had left D. arrived / left

Cho a+b = 25, ab= 136 Tính A= a^2 + b^2 B= a^3 + b^3 C= a^4 + b^4