các anh em chuyên toán ơi giúp em cái cho 3 số dương a,b,c thỏa mãn hệ +) a ²+ab+$\frac{b ²}{3}$=25 +)$\frac{b ²}{3}$+c ²=9 +)c ²+ac+a ²=9 tính P=ab+2bc+3ac admin câu lúc trước không ai trả lời em mới hỏi thêm để có đáp án để làm thôi chứ không có ý gì đâu

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Question I. Find the word which has different sound in the part underlined. 1. A. brainstorm B. sailing C. railway D. captain 2. A. plane B. safety C. traffic D. station 3. A. vehicle B. mention C. enter D. helicopter 4. A. hey B. honey C. obey D. grey 5. A. happy B. house C. here D. hour 6. A. maps B. papers C. cats D. books 7. A. pollution B. question C. education D. action 8. A. healthy B. ahead C. bread D. seatbelt 9. A. those B. there C. that D. thanks 10. A. walked B. opened C. stopped D. watched 11. A. sound B. cloud C. found D. favourite 12. A. tool B. afternoon C. door D. school 13. A. played B. closed C. filled D. needed 14. A. mention B. question C. action D. education 15. A. frightened B. amazed C. disappointed D. terrified 16. A. thread B. beam C. breath D. stead 17. A. parade B. waste C. later D. gravy 18. A. populated B. loaded C. wanted D. lived 19. A. ahead B. bread C. pleasant D. seatbelt 20. A. energy B. flying C. chemistry D. technology. 21. A. naked B. cooked C. booked D. walked 22. A. stops B. laughs C. says D. claps 23. A. obey B. key C. grey D. survey 24. A. stayed B. washed C. filled D. annoyed 25. A. who B. when C. where D. what 26. A. embarrassed B. crowded C. excited D. divided 27. A. ahead B. instead C. seatbelt D. bread 28. A. left B. centre C. enter D. frighten 29. A. wanted B. filled C. stayed D. played 30. A. washed B. needed C. danced D. matched Question II. Find the word which has different stress pattern from the others. 1.A. silent B. noisy C. pretty D. polite 2. A. station B. season C. sandal D. police 3.A. agree B. hurry C. enter D. visit 4.A. describe B. fasten C. listen D. hover 5.A. degree B. student C. funny D. widen 6.A. traffic B. dancer C. cycling D. balloon 7. A. central B. gripping C. complete D. boring 8.A. answer B. listen C. enter D. obey 9.A. station B. healthy C. safety D. alone 10.A. tidy B. complete C. extend D. mistake 11. A. dangerous B. plentiful C. another D. limited 12. A. easily B. energy C. consumption D. negative 13.A. convenient B. abundant C. different D. expensive 14.A. petroleum B. advantage C. tendency D. enormous 15.A. attention B. pollution C. holiday D. effective