$*$ Cách 1:
`(x^2-2x+1)(x-1)`
`=(x-1)(x^2-2x+1)`
`=x.(x^2-2x+1)-1.(x^2-2x+1)`
`=x.x^2-2.x.x+x-(x^2-2x+1)`
`=x^3-2x^2+x-x^2+2x-1`
`=x^3+(-2x^2-x^2)+(x+2x)-1`
`=x^3-3x^2+3x-1`
$*$ Cách 2:
`(x-1).(x^2-2x+1)`
`=(x-1).(x-1)^{2}`
`=(x-1)^3`
Áp dụng hằng đẳng thức:
`(A-B)^3=A^3-3A^2B+3AB^2-B^3`
Đáp án + Giải thích các bước giải:
`=x(x^2-2x+1)-1(x^2-2x+1)`
`=x*x^2-x*2x+x*1-1*x^2+1*2x-1*1`
`=x^3-(2x^2+x^2)+(x+2x)-1`
giúp mình với https://img.hoidap247.com/picture/question/20210612/tini_1623505402555.jpg
vẽ anime/chibi/... tức, tức ko còn j để ns, tức pay màu! (ko nhận tranh sẵn, vẽ có tâm vào. đang tức điên máu nên ai có ý định vô đêy chọc tức tui thì... coi chừng cái bản mặt nha) .-. NL: có ai tình nguyện vác cái lưng ra đêy để tôi đập cho vài cái ko?! tức lắm r đếy nhá .-.
Cho hình chữ nhật ABCD. Trên AB lấy điểm M sao cho AM gấp rưỡi MB. a) So sánh diện tích tam giác AMC và diện tích tam giác ACD. b) AC và AM cắt nhau tại O. Biết diện tích tam giác AOM bằng 27 cm2. Tính diện tích hình chữ nhật ABCB.
Số nghiệm của PT x ²-3x+6 /x ²-9 =1 /x-3
cần gấp lắm ạ làm hộ em với Question 21. We (know) ________________ Betty since she moved to our neighborhood. Question 22. The children are interested in (take) ________________ to the zoo on Sunday. Question 23. You (watch) ________________ TV when your father came home last night? Question 24. My parents want me (pass) ________________ the entrance exam to High Secondary School. Question 25. President Barrack Obama was __________ greeted by Vietnamese people. (warm) Question 26. One of the developments of television is ________________ TV. (act) Question 27. Good ________________ is essential in a large organization. (communicate) Question 28. This village was ________________ three years ago. (electric) Đọc đoạn văn sau và trả lời câu hỏi bên dưới. Scientists have known a lot about the earth. They understand how mountains are made and what a volcano is. The following example is about volcanic eruptions. Mt. Vesuvius in Italy and ML St. Helens in the USA are both famous mountains. They are both volcanoes. A volcano is a mountain that is open at the top. Smoke and hot air come out of the hole. Sometimes, very hot rock also comes out of the mountain. That can make trouble for people nearby. This is what happened with Mt. Vesuvius and Mt. St. Helens. Hot rock poured out of Mt. Vesuvius and covered the town of Pompeii in 79 AD. Everyone in the town was killed. The Mt. St. Helens volcano didn’t kill many people. Question 33. What is a volcano? Question 34. Are the Mt. Vesuvius and the Mt. St. Helens both famous volcanoes in Italy? Question 35. What happened to the people in the town of Pompeii in 79 AD? Question 36. Did the Mt. St. Helens volcano kill everyone? Question 37. He spent an hour watering the flowers yesterday. => It_________________________________________________ Question 38. Anna types more carefully than me. => I _________________________________________________ Question 39. People used to write everything by hand. => Everything__________________________________________ Question 40. She hasn’t phoned me for three months. => The last____________________________________________
Part I. Fill in each gap with ONE suitable word to complete the following paragraph. Our classes take place for three hours every morning from Monday (1)............. Friday. The maximum class size is twelve (2) .............. the average is ten. We use modern methods of (3) ............. and learning, and the school has a language laboratory, a video camera and recorders. However, you will only be successful in improving (4) ............. English if you work hard and (5) ........ speaking English as much as you can. You will take a short (6) ............. in English as soon as you arrive. In this way, we can put you in a (7) ............. at the most suitable level. There are two classes at the Elementary level; one is for complete beginners and the other is for students who know only a little English. In both classes you will practise simple conversations. In the class (8) ............. the intermediate level you will have a lot of practice in communication in real-life situations because we help you to use the English you have previously (9) ............. in your own country, You will also have chances to improve your (10) .............. of English grammar and to build up your vocabulary... Part II. Rewrite each of the following sentences so that it means exactly the same as the given one. Using the given word in brackets. Do not change the word. 1. I’m not you, but I think you should recycle these plastic carrier bags. (if) ……………………………………………………………………………………………….. 2. Emma came first because she worked hard. (result) ………………………………………………………………………………………………. 3. Eating too much sugar can result in health problems. (lead) ………………………………………………………………………………………...…….. 4. All flights had to be cancelled as a result of the pilots’ sudden strike. (so) ………………………………………………………………………………………….…… 5. If I could swim, I would go scuba diving with Terry. (because) ……………………………………………………………………………………………….
Giúp mình câu b Nhanh nhé để mình check đáp án
Cho dg tròn (O ,R) .kẻ cát tuyến cắt đg tròn tại hai điểm A ,B sao cho kẻ đc 2 tiếp tuyến nhận A ,B làm tiếp điểm .M là giao điểm của hai tiếp tuyến ,AM=BM=2R .Giá trị của phép tính /OM-AB/
Đường tròn `(O)` bán kính `5` dây `AB` dài `8` tính khoảng cách từ `O` đến `AB`
Làm trong 10 p nha từ câu 45678910
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến
