a) `(x-2)^2+x(3-x)=-3`
⇔`x^2-4x+4+3x-x^2=-3`
⇔`-x=-7`
⇔`x=7`
Vậy `S={7}`
b) `36x^2+12x+1=0`
⇔`(6x)^2+2.6x.1+1^2=0`
⇔`(6x+1)^2=0`
⇔`6x+1=0`
⇔`6x=-1`
⇔`x=-1/6`
Vậy `S={-1/6}`
`a) (x-2)^2 + x.(3-x) = -3`
`<=> x^2 - 4x +4 +3x-x^2 = -3`
`<=> -x = -7`
`<=> x=7`
`b) 36x^2 + 12x +1 =0`
`<=> (6x+1)^2 = 0`
`<=> 6x+1=0`
`<=> x=-1/6`
3 I felt better by the summer, but the doctor warned me not to do too much. I.....(be) very ill 4. At last the committee were ready to announce their decision. They.......(make) up their mind
3.1. I______ (dream) about a holiday in Greece. I couldn't believe it when my husband ______ (book) one as a surprise! For exam: come-meet (1 Point) Enter your answer 4.2. When I ______ (arrive) it was clear she______ (work). There were papers all over the floor and books everywhere. For exam: come-meet (1 Point) had arrived-worked 5.3. I ______ (wait) for hours so I was really glad when the bus finally ______ (arrive). For exam: come-meet (1 Point) had been 6.4. She was exhausted because she______ (work) since eight o'clock that morning (1 Point) Enter your answer 7.5. The children were wet because they ______ (play) football in the rain. (1 Point) Enter your answer 8.6. The passengers were cross because the airline ______ (lose) everyone's bags (1 Point) Enter your answer 9.7. The roads were blocked in the morning. It______ (snow) all night (1 Point) Enter your answer 10.8. Before we ______ (collect) parked our car we the ticket. (1 Point) Enter your answer 11.9. Carol had a detailed map in her handbag but she______ (leave)her glasses at home and could not read it. (1 Point) Enter your answer 12.10. His English was perfect. He______ (study) it since he started school. (1 Point) Enter your answer 13.11. I ______ (sleep) at 11:30 p.m this evening. (1 Point) Enter your answer 14.12. I'm sure that next year this city ______ (look) much better. (1 Point) Enter your answer 15.13. I think he ______ (find) this work more interesting when he grows up. (1 Point) Enter your answer 16.14. I______ (not do) anything till Monday. (1 Point) Enter your answer 17.15. His boss ______ (speak) with him tomorrow at 1:00 p.m. (1 Point) Enter your answer 18.16. I ______ (help) you as soon as I finish this project. (1 Point) Enter your answer 19.17. The truck ______ (pick up) the money later tomorrow afternoon. (1 Point) Enter your answer 20.18. Tomorrow at this time, I ______ (attend) a conference. (1 Point) Enter your answer 21.19. The police officer______ (arrest) the thug after you identify him. (1 Point) Enter your answer 22.20. You should recognise her easily. She______ (wear) a red skirt. (1 Point) Enter your answer 23.21. By the end of the month I ______ (live) in this town for ten years. (1 Point) Enter your answer 24.22. She______ (return) from the excursion by 6 o'clock. (1 Point) Enter your answer 25.23. When I travel to England next year I ______ (study) English for over four years, so I think I'll be ready. (1 Point) Enter your answer 26.24. He ______ (read) this book for 15 days by the end of this week. (1 Point) Enter your answer 27.25. We ______ (look) for him for 40 days by next Saturday. (1 Point) Enter your answer 28.26. I'm only halfway through my homework. I______ (not finish) it before the teacher arrives. (1 Point) Enter your answer 29.27. There won't be anyone in the office. Everyone______ (go) home (1 Point) Enter your answer 30.28. They______ (wait) for the president for 5 hours (1 Point) Enter your answer 31.29. As soon as we reach the Italian coast, we ______ (sail) for a week. (1 Point) Enter your answer 32.30. At midnight the speakers ______ (present) their projects for more than ten hours (1 Point)
giúp mình bài này với ạ, ai nhanh mình sẽ đánh giá 5* và câu trả lời hay nhất ạ
Bạn Lan đi bộ từ nhà hết 10min,nhà bạn đến trường hết 0,6km a)Tính tốc độ trung bình của bạn Lan đi từ nhà đến trường b)Nhà bạn Mai cách trường 1,8km và thời gian đi đến trường là 20 min.Hãy cho biết bạn nào chuyển động nhanh hơn.Vì sao?
I. Sentences with verbs : Continue and begin 1. American people begin to love football. Football ...................................................................................................... 2. He will continue to eat hamburgers next time. Hamburgers........................................................................................ 3. They began to plant rubber trees in big plantations. Rubber trees ............................................................................. 4. He’ll continue to read this article. This article...... ...................................................................................................... 5. People can continue to enjoy natural resources. ………………………………................................................................................................………………………….
Em hãy viết một đoạn văn ngắn(3-5 câu) giới thiệu khái quát về tác giả, tác phẩm tây tiến.
đây là bài hóa nha: có nhận đinh con người đang khai thác quá mức và ko có kế hoạch có thể khiên các nhiên liệu cạn kiệt .theo em nhận định trên là đúng hay sai ? hãy tìm vd minh chứng cho nhận định của em
Giúp nhé <3333333333333333333333
giúp mik trang 64 65 66 sgk cánh diều tập 1 nhé
1.Viết lại tên riêng nước ngoài cho đúng quy tắc: xukhômlinx 2.Viết lại tên riêng nước ngoài cho đúng quy tắc: lúcxămbua 3. Viết lại tên riêng nước ngoài cho đúng quy tắc: la phôngten 4. Viết lại tên riêng nước ngoài cho đúng quy tắc: inđônêxia 5. Viết lại tên riêng nước ngoài cho đúng quy tắc: tôn trung sơn 6 Viết lại tên riêng nước ngoài cho đúng quy tắc: tây ban nha
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