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???

1.Hiện nay tuổi mẹ gấp 3 lần tuổi con. Cách đây 4 năm, tổng số tuổi của hai mẹ con là 44 tuổi. Tuổi con hiện nay là: .... tuổi 2.Lãi suất tiết kiệm là 0,9% / 1 tháng. Một người gửi tiết kiệm 10 triệu đồng. Sau 1 tháng người đó nhận cả gốc lẫn lãi là: ....... đồng

Đặt câu hỏi cho phần trong (.......) : 1.- (The children )swam in the lake. ……………………………………………………………………………………………………… 2.-( The glass) fell of the table. ……………………………………………………………………………………………………… 3.- They saw (lions and tigers )at the zoo. …………………………………………………………………………………………………….. 4.- He left the party( at 11.o’clock.) ……………………………………………………………………………………………………… 5.- John went (to the beach) last Sunday. …………………………………………………………………………………………………….. 6.- He gave her( a bunch of flowers) for her birthday. ……………………………………………………………………………………………………… 7.- The company sent the new worker( to California.) …………………………………………………………………………………………………….. 8.- My sister dreamt about( the monster) last night. ……………………………………………………………………………………………………… 9.- My grandmother heard a loud scream (last night.) …………………………………………………………………………………………………….. 10.- We went to the History Museum. …………………………………………………………………………………………………….. 11.- He fell ( because he slipped on a banana peel.) ……………………………………………………………………………………………………… 12- The teacher was angry( because he didn’t do his homework.) …………………………………………………………………………………………………….. 13.- It took( us about half an hour) to get to school. …………………………………………………………………………………………………….. 14.- She last rode a bike (two weeks ago.) …………………………………………………………………………………………………….. 15.- I bought (half a kilo) of cheese. …………………………………………………………………………………………………….. 16.- He (took his driving test) two days ago. ………………………………………………