tìm x, biết: (x+2)/21 + (x+2)/22 + (x+2)/23 = (x+2)/27 + (x+2)/28

giúp mk nhá :)))))))))))))))))))))))))))

Giải nhanh giúp mình với ạ. Cảm ơn

Cho A = {(x, y, z) 2 N^3|x + y + z = 10} và B là tập các dãy gồm hai số 0 và bảy số 1(chẳng hạn dãy 110111110 là một dãy thuộc B). Chứng minh rằng |A| = |B|.

V. Read the passage carefully, then choose the best option A,B,C or D to answer each question. (1pt) Son Doong Cave has become more famous after the American Broadcasting Company (ABC) aired a live programme featuring its magnificence on ‘Good Morning America’ in May 2015. Located in Quang Binh Province, Son Doong Cave was discovered by a local man named Ho Khanh in 1991, and became known internationally in 2009 thanks to British cavers, led by Howard Limbert. The cave was formed about 2 to 5 million years ago by river water eroding away the limestone underneath the mountain. It contains some of the tallest known stalagmites in the world - up to 70 metres tall. The cave is more than 200 metres wide, 150 metres high, and nearly 9 kilometres long, with caverns big enough to fit an entire street inside them. Son Doong Cave is recognised as the largest cave in the world by BCRA (British Cave Research Association) and selected as one of the most beautiful on earth by the BBC (British Broadcasting Corporation). In August 2013, the first tourist group explored the cave on a guided tour. Permits are now required to access the cave and are made available on a limited basis. Only 500 permits were issued for the 2015 season, which runs from February to August. After August, heavy rains cause river levels to rise and make the cave largely inaccessible. 30. Son Doong Cave was discovered in ______. A. 2015 B. 2013 C. 2009 D. 1991 31. What happened to Son Doong Cave in May 2015? A. It was discovered by a local man named Ho Khanh. B. A live programme featuring its magnificence was broadcast on ‘Good Morning America’ by the American Broadcasting Company (ABC). C. It became known internationally thanks to British cavers, led by Howard Limbert. D. It was explored by the first tourist group. 32. Which statement is NOT true about Son Doong Cave? A. Tourists can explore Son Doong Cave daily throughout the year. B. The cave was formed about 2 to 5 million years ago. C. It was formed by river water eroding away the limestone underneath the mountain. D. Some of the stalagmites in Son Doong Cave are about 70 metres tall. 33. From the passage, we know that ______. A. there is a street inside Son Doong Cave B. the cave is always covered with rain water C. few tourists want to come to the cave D. tourists need permission to explore the cave Giúp hộ :((( cảm ơn

3. A. iSSue B. paSSion C. tiSSue D. veSSel 4. A. hASTy B. nASTy C. tASTy D. wASTage 6. A. hOMe B. tOMb C. cOMb D. dOMe 7. A. sAYS B. bAYS C. dAYS D. rAYS 8. A. nOne B. tOmb C. tOngue D. Onion

IV. Choose the word (A, B, C or D) that best fits the blank space in the following passage. (lpts) ​One good reason for people to learn a foreign language is work. If your work involves regular contact with (1)_________ of foreign languages, being able to talk to them in their own languages will help you to communicate with them. It may also help you to make sales and to negotiate and secure contracts. Knowledge of foreign language may also increase your chances of (2)_________ a new job, getting a promotion or a transfer overseas, or of going on foreign business (3)_________ ​Many English-speaking business people don’t bother to learn other languages because they believe (4)_________ most of the people they do business with in foreign countries can speak English, and if they don’t speak English, interpreters can help. The (5)_________ of foreign language knowledge puts the English speakers at a disadvantage. In meetings, for example, the people on the other side can discuss things among themselves in their own language without the English speakers understanding, and using interpreters slows everything down. In any socialising after the meetings, the locals will probably feel more comfortable using their own language rather than English. 25.​A. talkers​B. sayers​C. tellers​D. speakers 26.​A. looking​B. finding​C. applying​D. offering 27.​A. trips​B. journeys​C. tours​D. holidays 28.​A. what​B. when​C. that​D. how 29.​A. use​B. study​C. fluency​D. lack Giúp hộ :)) cảm ơn

chỉ mình cách vẽ khuôn mặt với ạ

mọi người giúp em 2 bài này với ạ

Giúp hộ gấp II. Circle the answer A, B, C or D in each group whose underlined part is pronounced differently from that of the others. (1 pt)​ 9. A. nominated B. polluted C. provided D. destroyed 10. A pull​ B. erupt C. trust D. thunder 11. A. disappoints B. sprays C. wonders D. persuades 12. A. town B. known C. down D. brown III. Choose the best answer among A, B, C or D to complete the sentences. (2.5 pts) 13. Companies now realize that_____ want products that will not only work effectively, but also save money. A. consumers​​B. consumes​​C. consumption​D. consumed 14. The National Hospital for Tropical Diseases has discovered two new variants _______ SARS-CoV-2 after gene sequencing of patient samples. A. in ​ B. of ​ ​ C. at ​ ​ D. by 15. The article was posted by Jimhello on Tuesday,………………? ​A. didn’t it​​B. wasn’t it​​C. was it​​D. did it 16. Tet is a festival…………… occurs in late January or early February. ​A. whom​​B. when​​C. where​​D. which 17. My sister is very fond…………… eating chocolate candy. ​A. at​​​B. about​​C. of​​​D. with 18. When he lived in the city, he …………… to the theater twice a week. ​A. uses to go​​B. has gone​​C. used to go​​D. was going 19. If she came to the party, she_________him A. would have met B.would meet C. will meet D. met 20. “ Why don’t you come over and see the new film with me ? ” - “ _________ ’’ A. Wow! I didn’t realize that B. I’m afraid not C. Sure. Please do D. Great, I’d love to. 21. She was sick yesterday, …………she was absent from school. A. since​​B. so​​​C. because​​D. but 22. Every year, thousands of people __________ because of natural disasters. A. have been killed ​ B. is killed ​ C. are killed D. were killed 23. My parents enjoy the __________ atmosphere in the countryside. A. peace B. peaceful C. peacefully D. peacefulness 24. We hope Bacgiang _________ the Covid-19 before the entrance exam in June, 2021. A. will control B. controls C. has controlled D. are controlling