1 xe ô tô đi đoạn đường AB dài 90km trong 90p, đoạn BC dài 250km trong 120giây .tìm vận tốc trung bình trên cả đoạn đường

Chứng minh rằng a^5-5a^3+4a chia hết cho 120 với mọi số nguyên a

Gấp ạ hứa vote 5sao bshsbsbsjsbsbsnsbsjsjsbz zsbjshbs

Chỉ ra Sự khác biệt giữa đêm giáng sinh của cô bé bán diêm và giáng sinh của các nhà khác :))) 50đ

Dùng hằng đẳng thức để giải các phép tính sau (rút gọn tối giản luôn nhé) `(1+x+x^2)(1-x)(1+x)(1-x+x^2)` giải giúp mình với, ai giỏi thì vào giải nha, nhanh lên em cần gấp em sẽ cho 5* và câu trả lời hay nhất

Mn giúp e với Giải phương trình

Kể lại 1 câu chuyện cảm động em đc chứng kiến ,đc đọc đc nghe về thời kì chống dịch

Giải thích tại sao chọn 1. When he ...... into the office, the secretary a crosswords puzzle. A. came/ was doing B. was coming/ was doing C. was coming/ did D. came/ did 22. Why ... to me while I .... ? A. did you not listen/ was speaking B. were you not listening/ was speaking C. were you not listening/ spoke D. did you not listen/ spoke 3. While I..... for him to call up, he ....a good time in the bar. A. waited/ was having B. have waited/ was having C. was waiting/ have had D. was waiting/ was having 4. They this film lately. A. have seen B. saw C. have been seeing D. were seeing 5. She the picture when I came. A. painted B. has painted C. was painting D. have been 6. She a bath at seven o’clock last night. A. was having B. had C. has had D. has been having 7. She dishes already. A. was washing B. washed C. has washed D. has been washing 8. They supper when the telephone rang. A. had B. have had C. were having D. have been having 9. I you for ages. A. didn’t meet B. haven’t met C. was not meeting D. haven’t been meeting 10. Last summer he to Ha Long Bay. A. has gone B. was going C. went D. has been going

60 đ có tâm tí á đừng viết về truyện kiều ( chỉ viết về nguyễn du thôi ) viết về truyện kiều = báo cáo và 1 sao

Các bạn ơi giúp mình với mình đang gấp