Chứng minh rằng : a, M = 21^9+21^8+21^7 +....+ 21+1 chia hết cho 2 và 5 b, N = 6+6^2+6^3 +....+ 6^2020 chia hết cho 7 nhưng không chia hết cho 9 c, P = 4+4^2+4^3 +....+ 4^23+4^24 chia hết cho 20 và 21 d, Q = 6+6^2+6^3 +....+ 6^99 chia hết cho 43 Hộ mình làm bài này nhá :)))))))) Vote 5* + 1 cảm ơn và câu trả lời hay nhất

Giải giúp mk vs ạ ( có lời giải cho mk vd nha )

vẽ mầm ha cute zô ko đừng trách tui nl đừng chat nhìu -.-"" cho tui tâm sự

Chứng minh rằng: a. Đa thức f(x) có ít nhất hai nghiệm nếu: x.f(x+1) = (x+3).f(x-1). b. Đa thức f(x) có ít nhất ba nghiệm nếu: x.f(x+2) = (x^2 -9).f(x)

giúp mình vs ah đg cần gấp đề bài : Read the following passage and answer the questions below Everyone in this world has a favorite place. Some people tend to stay at their workplaces and some people like to spend time at restaurants, but I am introvert and I mostly like to spend time at my home. I love my house and my favorite room in my house is my bedroom. My bedroom is on the first floor of my house and it is a very beautiful room. I spend most of time in my bedroom. The first thing is that I sleep in my bedroom, so it is the place which gives me the ultimate relaxation. I also like to watch movies in my room. Some people like to watch movies in their living room but I think otherwise. I want privacy and my bedroom is the only place where I can get it. There is no noise, no disturbance. My friends also like my room and whenever they come to my house, they prefer to sit in my room. Where does the author mostly like to spend time? …………………………….. Which room does the author like best? …………………………….. Why does the author want to watch movies in her/ his bedroom? …………………………….. Where do his/ her friends prefer to sit when visiting him/ her? …………………………….. What is the main content of the passage? ……………………………..

Vẽ semi NL: làm cái j, thì đừng để bị gắn ghép với từ "quá", không đến lúc quen tay không dừng lại được, là khổ đấy bạn trẻ

VI- Match the questions and answers, and write the answers in the blanks. 26. What are you doing on Sunday? a. Jenny-she’s visiting her mum. 27. Are you helping John tomorrow? b. At the station, I think. 28. What’s Sarah doing tomorrow? c. No, certainly not. He never help me. 29. Where’s John meeting us? d. I’m working until lunchtime. 30. Who isn’t coming to the party tomorrow? e. She’s playing in the basketball tournament. 25. _______ 26. _________ 27. ________ 28. ________ 29. _________ 30. ________

Viết đoạn văn khoảng 200 chữ trình bày suy nghĩ của bản thân về ý nghĩa của những đóng góp thầm lặng trong cuộc sống

1.He never believes what she has said to him -> Never..... 2.His fashion style is very impressive but it isn't to my taste ->Impressive as..... 3.It was wrong of you to allow her to go out at night ->You should

Giúp mình câu 1 đc ko mình cảm ơn các cậu