giúp mình nha mấy bạn,mình vote cho 5 sao

mik đang kt các ban giúp mik vói a

Giúp mik vs a.... ghi cả cái sửa lỗi nx nha

x€B(4) và x<20 Giải giúp em bài tập này với

1. Điểm khác nhau giữa các nucleotit là gì? 2. Căn cứ vào đâu mà các nhà khoa học phân loại và đặt tên cho ARN?

1. Mai asked me: “Why didn’t you come?”  Do you enjoy reading?” Phong asked Peter. 2. “Do you like sports?” Hoa asked Lan. 3. “Do your sister and brother go to the same school?” she asked Nam. 4. “Are there some oranges in the fridge?” she asked her mom. 5. “Will it rain tomorrow morning?” he asked his friend. 6. “How do you go to the airport?” his friend asked him. 7. “How much does this dress cost?” Lan asked Mai. 8. Ba asked Tam, “How often do you wash your clothes?” 9. “When will your father leave Vietnam for America?” Phong asked Thu. 10. “How many books do the students need?” the librarian asked my teacher. 11. He asked me: “When do you finish your work?” 

Tìm số tự nhiên n sao cho : a) 2 mũ n + 22 là một số nguyên tố b) 13n là một số nguyên tố

Question 2:Choose the best answer a, b, c, or d to complete the sentence. (2.0 pts) 5. She is having ______. She's hot and coughs a lot. A. spots B. flu C. earache D. stomachache 6. Although he practised a lot, his legs still ______ weak. A. are B. was C. felt D. has 7. They could not afford to buy the house because it was _______. A. too pretty B. too tight C. too expensive D. too cheap 8. _______ do you do volunteer work? - Every weekend. A. How long B. How far C. How much D. How often 9. Have you ever _______ part in volunteer work? A. taken B. to take C. taking D. take 10.We have raised money for people in need _______ 2015. A. in B.at C. since D. for 11. She’s got a high _______ – almost 40°. A. flu B. headache C. sore throat D. temperature 12. Jane is _______ weight because she eats too much junk food. A. getting over B. putting on C. taking up D. throwing away 13.The charity _______ facilities for disabled people to take part in sport. A. provides B. donates C. raises D. collects 14.I can’t fasten my jeans – I’ll have to _______. A. eat more junk food B. go out regularly C. see my doctor D. go on a diet 15. My favorite hobby is __. I spend most of my free time making vases and bowls from clay. A. carving wood B. making pottery C. making model D. bird watching 16. I’ve already done my homework , _______ I am going to watch TV. A. so B. because C. but D. and 17. They could not afford to buy the house because it was _______. A. too pretty B. too tight C. too expensive D. too cheap 18. _______ do you do volunteer work? - Every weekend. A. How long B. How far C. How much D. How often

Cho (O, R) và một điểm A thuộc (O). Kẻ dây BC vuông góc với OA tại trung điểm M của OA. a. Tứ giác OCBA là hình gì? Vì sao? b. Tiếp tuyến với đường tròn tại B cắt đường thẳng OA tại E. Tính độ dài BE theo R.

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