Một kg gạo tẻ đổi được 3/4 kg gạo nếp. Hỏi: 2 kg; 1/2 kg; 2/5 kg gạo tẻ đổi được bao nhiêu kg gạo nếp?

-12/4<x<=4/2 tim x la Z tra loi nhanh ho em voi

Minh dang can gap ,moi người giai giúp mik

1+1/1.3+1/3.5+......+1/19.21=x-1/2[tìm x đó nhaaaaaaaaa]

Ai giải giúp mình 15 câu này với ạ mình đang cần gấp hứa sẽ vote 5* mình cảm ơn

Bài 1 :Viết các tập hợp sau theo cách liệt kê các phần tử (không cần giải thích): a/ A = {x Î Z / -6 ≤ x < 3 } b/ B={ xN / x┇18 ; x┇24 và x < 450 }

Giải hộ em với ạ em cảm ơn anh chị

Giúp mình câu 3 và 4 a nha cảm ơn ạ

1. My brother likes watching TV …………. I like going out with my friends. A. and B. but C. or D. so 2. My father ……………………… a car to work every day. A. drive B. to drive C. driving D. drives 3. ………….. do you take morning exercises ?- Because it is good for my health. A. What B. When C. Why D. Where 4. ……………………..… apples do you want to buy ? A. How often B. How far C. How much D. How many 5 .Do you know……………… Hoa is ? – She is at school now. A. which B. who C. where D. what 6. ………….. do you play football ? – Because I like it. A. Why B. Which C. Where D. What 7. …………….. do you go to school ? I go to school by bike. A. How B. What C. When D. Where 8. My brother used to go to work ………………………. bike. A. by B. to C. on D. in 9. I …………..…………. to school on foot. A. go B. to go C. going D. goes 10. I like watching TV, ………………. I watch it in my free time. A. so B. when C. but D. or 11. …………. do you brush your teeth ?- Twice a day. A. How often B. How far C. How many D. How much 12.I want to work in television industry, …………. I am working hard. A. because B. although C. so D. and 13.Children almost like watching …………………. A. cartoon B. weather C. news D. horror film 14. Rio de Janeiro is ____________________ Sydney. A. hotter than B. hotter C. more hotter D. most hotter 15. Tokyo is ____________________ among three cities. A. largest B. the largest C. more largest D. the most largest 16. They ________ the bus yesterday. A. don’t catch B. weren’t catch C. didn’t catch D. not catch 17. My sister ________ home late last night. A. comes B. come C. came D. was come 18. My father ________ tired when I ________ home. A. was - got B. is - get C. was - getted D. were - got 19. What ________ you ________ two days ago? A. do - do B. did - did C. do - did D. did - do 20. Where ________ your family ________ on the summer holiday last year? A. do - go B. does - go C. did - go D. did - went nhanh vào đúng mik cho câu trả lời hay nhất nha

Cho tam giác ABC đồng dạng tam giác DEF. Nếu A= 80 độ, B = 70 độ và DE = 2cm, DF= 3cm, AB = 4cm Tính AC???