tìm x , y thuộc z : 1. 2x-y-x.y=3 2. x.y +3x+2y=-16
. Daisy’s friend _______ out when she arrived at the theatre. * 5 điểm A. goes B. has gone C. have gone D. had gone 9. Phong _______ that the plan will be changed. * 5 điểm A. has told B. has just been told C. has been just told D. had just been told 10. When I was a secondary school student, I ________ a scholarship. * 5 điểm A. use to award B. used to award C. used to be awarded D. use to be awarded 11. Many people _______ for posting false information on the Internet. * 5 điểm A. fined B. have fined C. are fined D. was fined 12. If our schools are still closed because of the pandemic, we ________ to study online. * 5 điểm A. would try B. wouldn’t try C. tried D. will try 13. Her English is not good. If she ________ English well, she _________ able to get a good job in a foreign company. * 5 điểm A. speak / can be B. spoke / were C. speak / were D. spoke / would be 14. If everybody ________ to the fight against COVID-19, we will win soon. * 5 điểm A. contribute B. contributes C. are contributing D. is contributed 15. After Larry ________ the film on TV, he decided to buy the book. * 5 điểm A. have seen B. has seen C. had seen D. saw 16. Tom _______ to the party many months ago. * 5 điểm A. is invited B. was invited C. is being invited D. was being invited 17. Hurry! The train________. I don't want to miss it. * 5 điểm A. comes B. is coming C. came D. has come 18. While her husband was in the army, Janet________ to him twice a week. * 5 điểm A. wrote B. was writing C. was written D. had written 19. Laura said she had worked on the assignment since _______. * 5 điểm A. for one week B. some days ago C. the week before D. the next week 20. A lot of money _______to help the government to overcome difficulties in the fight against COVID-19 so far. * 5 điểm A. has been donated B. has donated C. had been donated D. donated 21. The online lesson on TV ________ at this time. * 5 điểm A. studies B. is being studied C. has been studied D. was studied 22. Henry________ into the restaurant when his friend was having dinner. * 5 điểm A. was going B. went C. has gone D. had gone 23. Ask her to come and see me when she ________ her work. * 5 điểm A. finish B. has finished C. finished D. finishing 24. I wanted to know ______ return home. * 5 điểm A. when would she B. when will she C. when she will D. when she would 25. "Can you open the door for me, Tom?" Ann asked. * 5 điểm A. Ann asked to open the door for her, Tom. B. Ann asked Tom to open the door for her. C. Ann asked Tom open the door for her. D. Ann asked Tom to open the door for me. 26. I think you should stop playing games. * 5 điểm A. If I am you, I will stop playing games. B. If I were you, I will stop playing games. C. If I were you, I would stop playing games. D. If I had been you, I would stop playing games. 27. We often do our online practice tests very responsibly. * 5 điểm A. Our online practice tests very responsibly are often done. B. Our online practice tests often do very responsibly. C. Our online practice tests are often done very responsibly. D. Our online practice tests are very often responsibly done. 28. Hurry up or we will miss the programme of "Learning English on TV". * 5 điểm A. Unless you hurry, you won’t miss the programme of "Learning English on TV". B. If you hurry, you will miss the programme of "Learning English on TV". C. If you don’t hurry up, you will miss the programme of "Learning English on TV". D. Unless you hurry up, you don’t miss the programme of "Learning English on TV"
Cho x thuộc{-3; -2; -1; 0; 1; 2;...; 10} ; y thuộc { -1 ; 1; 0; 1; ...; 5} . Biết : x + y = 3. Tìm x, y
Một lớp họ có 25 học sinh ,trong đó có 13 học sinh nam . Hỏi số học sinh nam chiếm bao nhiêu %số HS của lớp đó
2: Cho hình chóp S.ABCD có đáy ABCD là hình thoi tâm O. Biết SA = SC; SB = SD a) Chứng minh SO vuông góc (ABCD) b) Gọi I, J lần lượt là trung điểm của AB, BC. Chứng minh IJ vuông góc (SBD) mình chỉ cần câu b thôi mong m.n giúp m với mình cho 5 sao
số dân của xã bình minh năm nay là 1275 người,với mức tăng dân số hằng năm của xã là 8% thì dân số xã bình minh là bao nhiêu người ?
tính nhanh 1-2+3-4+5-6.......+2019
Giải bài toán sau bằng cách lập hệ pt: Tìm hai số tự nhiên biết rằng: Tổng của chúng bằng 1012. Hai lần số lớn cộng số nhỏ bằng 2014
Cho ΔABC cân (AB= AC). Gọi Am là phân giác góc ngoài tại đỉnh A của tam giác đó. Chứng minh Am// BC .
Vote 5 sao cho câu tl nhanh và đúng ạ ♥️
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