a) (-25).21. (-2)2.(- ).(-1)2n+1 (n N*) b) (-5)3. 67. .(-1)2n(n N*) c) 35. 18 – 5. 7. 28 d) 24. (16 – 5) – 16. (24 - 5) e) 29. (19 – 13) – 19. (29 – 13) g) 31. (-18) + 31. ( - 81) – 31 h) (-12).47 + (-12). 52 + (-12) k) 13.(23 + 22) – 3.(17 + 28) m) -48 + 48. (-78) + 48.(-21) n) 135. (171 – 123) – 171. (135 - 123) p) - (-2009 + 97) – 74. (-18) + 74. (-118

It/ very important/ obey/ traffic rules/ when/ use/ road ai ghép câu này thành một câu hoàn chỉnh giúp em với em cảm ơn ạ

Bài 1: Tìm số nguyên x,y a)(x-1)(y+3)=3 b)(x+2)(2y-1)=7 c)(3x-2)(5-y)=-10 d)3x(y+2)-2(Y+z)=4

Huy, Cúc và Huệ được mẹ cho tiền mua sách. Số tiền của Huy chiếm 25% tổng số tiền, số tiền của Cúc chiếm 35% tổng số tiền, số còn lại là của Huệ. Tính số tiền của Cúc, biết Huệ nhiều hơn Huy 27000 đồng.

V. Complete the sentences with the correct form of the verbs in the bracket. 1. I was used to______________(eat) at noon when I started school. 2. He used to______________(eat) dinner at five o'clock. 3. When I was young, I used to______________(swim) everyday. 4. He used to________________(like) her, but he doesn't anymore. 5. Don't worry, some day you will get used to_____(speak) English. 6. Lan can't get used to_______________(study) 7. He used to_____________(dance) every night, but now he studies. 8. Adam is used to_______________(sleep) late on the weekends. 9. Chieks is used to______________(eat) American food now. 10. She finally got used to_______________(eat) our food. 11. When I was a child, I used ___________________ (dream) of being an astronaut. 12. I'm terribly nervous. I'm not used _______________ (speak) to a large audience. 13. It took us ages to get used _____________________ (live) in an apartment house. 14. Lots of trains used ___________________ (stop) here, but not many do now. 15. Didn't Nick use __________________ (work) on a building site? 16. I'll have an orange juice, please. I'm not used _________________ (drink) alcohol. 17. David doesn't seem to mind being in hospital. I suppose he's got used _______________ (be) there. 18. When Laura was at college, she used _____________ (have) a picture of Elvis Presley on her bedroom wall. 19. There used __________________ (be) a cinema here but it was knocked down a few years ago. 20. When she arrived in Britain, she wasn't used ___________ (drive) on the left, but she soon got used to it. ai biết làm thì giúp mình nha, camon.

Tìm số học sinh khối 6 của một trường THCS. Biết số học sinh trong khoảng từ 150 đến 300 học sinh và nếu xếp số học sinh khối 6 thành từng hàng 12 hay 15 thì đều vừa đủ hàng.

Các bạn giúp mình nhé ! Cảm ơn ! P/S : Đúng sẽ vote

Mn ơi bài này mk ko biết giúp mk vơi

Nung m gam hỗn hợp Fe và S thu được 12 gam hỗn hợp X gồm Fe, FeS, S. Cho hỗn hợp X tác dụng với lượng dư HNO3 đặc nóng thu được 33,6 lít khí NO2 (đktc). Khối lượng mỗi chất trong hỗn hợp là: A. 2,8 gam Fe và 9,2 gam S C. 5,6 gam Fe và 6,4 gam S B. 8,4 gam Fe và 3,6 gam S D. 11,2 gam Fe và 0,8 gam S

Làm giúp mình với ạ I. Chia động từ 1. I ………. (like) milk, meat and cola. 2. He ………. (play) badminton in the morning. 3. We………. (go) to bed at midnight. 4. My mom……….(do) housework on weekends. 5. The train……….(arrive) at 8.00 a.m. 6. My elder sisters……….(finish) works at 7 p.m. 7. Ann’s friends ………. (live) in a big house. 8. The dog………. (like) her, not me. II. Chọn dạng đúng của từ. Gạch chân từ em chọn 1. My dad is a doctor. He always wear/wears a white blouse. 2. My mom never drink/drinks wine. 3. Elizabeth go/goes shopping twice a month. 4. I have/has a pen. 5. Mary and John cut/cuts people’s hair. 6. Mark usually watch/watches TV before having dinner. 7. I and my brother go/goes to school on foot everyday. III. Dùng "do not" hoặc "does not" để hoàn thành những câu sau 1. I ............. prefer coffee. 2. She ............ ride a bike to her office. 3.Their friends .............. live in a small house. 4. They ............ do the homework on weekends. 5. Mike ............. play soccer in the afternoons. 6. The bus ............. arrive at 8.30 a.m. 7. We ................. go to bed at midnight. 8. My brother .............. finish work at 8 p.m. IV. Hoàn thành cách câu sau 1. ....... Jack like eating hamburgers? => Yes, ........ 2. ....... you get up early on Sundays? => No, ........ 3. ....... the students always work hard for the exam? => No, ........ 4. ....... the train leave at noon every day? => Yes, ........ 5. ....... he often play the guitar? => No, ........ 6. ....... they take a taxi to school every morning? => Yes, ........ 7. ....... Anna and Daisy visit their old teachers on winter holidays? => No, ........ 8. ....... water boil at 100 degrees Celsius? => Yes, ........ V. Điền dạng đúng của từ trong ngoặc 1. Emma (not study) ………. on weekends. 2. He (have) ………. a new shirt today. 3. I usually (have) ……….dinner at 6.40 p.m. 4. James (not/ study)……….very hard, so he never gets high scores. 5. My father often (teach)……….me Math on Saturday evenings. 6. I like English and she (like)……….Korean. 7. My sister (go)……….out every day. 8. We (not/ have)……….breakfast every morning. VI. Viết lại câu và điền đúng dạng từ trong ngoặc đơn: 1. My friends (sleep) on the floor. (rarely) =>____________ 2. She (stay) up late? (usually) => ____________ 3. I (do) the housework with my young sister. (often) => ____________ 4. Peter and Harry (come) to class in time. (never) => ____________ 5. Why Thomas (get) bad marks? (always) => ____________ 6. You (go) shopping? (often) => ____________ 7. She (cry). (seldom) => ____________ 8. My father (play) soccer. (never) => ____________ VII. Viết lại câu hoàn chỉnh Example: They / wear skirts to work? =>Do they wear skirts to work? 1. John/ want some drinks? =>________ 2. we / not / believe our teachers =>________ 3. Peter / understand the question? =>________ 4. We/ not / work late on Saturdays =>________ 5. They/ not / play games at the weekends =>________ 6. He/ have three sons=>________ 7. When / David / go to his Chinese class? =>________ 8. Why / you / have to clean up? =>_______ VIII. Đọc và hoàn thành đoạn hội thoại dưới đây bằng cách chia động từ: My cousin, Ron (have)………..a dog. It (be)………..an intelligent and beautiful pet with a short tail and big brown eyes. Its name (be)………..Rex and it (like)………..eating meat. Although Rex (bark)………..when strange guests visit, it (never/ bite)………..anyone; To be honest, Rex (be)………..very friendly. It (not/ like)………..eating fruits, such as apple, orange, banana, or grape, but it (often/ play)………..with them. If the weather (become)………..bad, Rex (just/ sleep)………..in his cage all day. Ron (play)………..with his dog every day after school. Because there (be)………..many people on the road, Ron (not/ let)………..the dog run into the road. Ron (often/ take)………..Rex to a large field in the park to enjoy the peace there. Rex (sometimes/ be)………..naughty, but Ron loves it very much.