`(x + 1)(2x - 3 ) - x^2 = (x - 2)^2`
`<=>x(2x-3)+(2x-3)-x^2=x^2-4x+4`
`<=>2x^2-3x+2x-3-x^2=x^2-4x+4`
`<=>2x^2-x^2-x^2-3x+2x+4x=3+4`
`<=>3x=7`
`<=>x=7/3`
Vậy `S= {7/3}`
Đáp án:
Giải thích các bước giải:
`(x+1)(2x-3) – x^2=(x–2)^2`
`⇔ 2x^2-3x+2x-3-x^2-x^2+4x-4=0`
`⇔ 3x-7=0`
`⇔ x=7/3`
Vậy `S={7/3}`
Calli chữ:"Min" ah Tradi nha Hicc khum bít viết calli mà rự dưng mua 1 bộ ...h nghĩ thấy tiếc tiếc như lào ấy:()
Bác Năm mới xây một cái hồ bơi với chiều rộng và dài lần lượt là 6 và 12,5m; có chiều sâu là 2m. Trong đó sức chứa của cái hồ là khoảng 0,5 m^2/ người (tính theo diện tích mặt đáy) a) Sức chứa của hồ bơi là bao nhiêu người? b) Khoảng cách của mực nước là bao nhiêu so với mặt hồ? Biết lúc này bác Năm cho người ta bơm thêm nước vào hồ với một lượng là 120 nghìn lít nước (1m^3=1000 lít)
Giúp mình với mn mình sắp phải nộp bài rồi mình cảm ơn nhìu
Cho hàm số y = x/x-1 (C).Tìm M thuộc(C) sao cho tiếp tuyến của (C) tại M cùng với 2 tiệm cận tạo thành 1 tam giác vuông cân
nhanh nhé mọi người 🥰🥰🥰🥰🥰🥰🥰🥰🥰🥰🥰
Giúp em với ạ,tại khó quá đối với người lên lớp của em ak
giúp mik đi ....20 đ đó nhanh lên đó nha
Giúp mik với Thanks mn nhiềuuuu
1. The tourists _________________ gathered their things and ran to the bus stop. (hurry) 2. I ate a ______________ breakfast yesterday morning. (hurry) 3. He is an ___________________ of this newspaper. (edit) 4. This ____________ was published in paperback this year.( edit) 5. Her ________________ is an honor to all of us. (attend) 6. This blouse costs _____________ 99,000VND. (approximate) 7. He is considered one of the greatest _____________ of the country. (hero) 8. It is an ___________________ journey, I really like it (interest) 9. The school is performing well, but we recognize the need for further ________ (improve) 10. Let me introduce you a ________________university. I think it’s really reliable. (repute) 11. We placed ___________ in a number of national newspapers. (advertise) 19. Do you know how to make a ____________ (speak) 20. He _____________________ answered these questions. (exact) 21. He is very __________in taking care of animals. (experience) 22. It is illegal to reproduce these books without permission from the ___________. (publish) 23. The book is now ready for _________________ (publish) 24. We often take part in many _____________ activities at school. (culture) 25. He can speak _______three languages included English, French, and Russian. (fluent) 26. I was amazed at Tom’s________________ in English. (fluent) 27. My mother thinks that watching television is time - ____________. (consume) 28. ____________ between audiences and participants is very important. (interact) 29. The next stage in the development of television is______________ TV. (interact) 30. Viewers are able to ask questions about the show by ___________their remote controls. (use) 31. Do you think Internet is ________________for modern life? (use) 32. Internet ________________ sometimes have to suffer various risks such as spam or electronic junk mail.(use) 33. People use the Internet for many purposes such as education and _____________. (communicate) 34. I can also __________________ with my friends and relatives by means of e-mail or chatting. (communication) 35. People can get a lot of the latest ___________________ from Internet. (inform) 36 The purpose of the media is _________ the public of what is happening in the world. (inform) 37. I read Tuoi Tre newspaper every day because it is __________________(inform) 38. How much time do you spend surfing the web a day? Please____________ to this questions. (response) 39. I am looking forward to your good __________________.(respond) 40. Nowadays, viewers can watch a ______________of local and international programs on different channels. (vary) 41. Internet users sometimes have to suffer ¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬____________ risks such as spam or electronic junk mail. (vary) 42. What _________________ does TV bring about to people’s life? (beneficial) 43. This new law will ________________ to the poor. (beneficial) 44. A good diet is ___________________ to health. (benefit) 45. You have obviously ____________from living in an English-speaking country while studying the language (benefit) 46.Today ________________ can predict when a tidal wave will hit land. (science) 47. We were worried about the _________________ of the painting. (appear) 48. Astronauts must be in an ____________________ physical condition (excellence) 49. They like watching ________________ programs on TV. (entertain) 50. We asked her to take part but she made no..... ..... ..... ............... to us. (respond)
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