Giải giúp mik chính xác mik cần gấp ạ!!!

giúp mình với mình chuẩn bị nộp rồi huhu TvT (Toán hình lớp 8 nha )

Câu 4 : Tính giá trị biểu thức: a, A= 1500 – { 52 . 23 – 11 . [ 72 – 5 . 23 + 8 . ( 112 – 121 ) b, B= 32 . 103 – [ 132 – ( 52 . 4 + 22 . 15 ) ] . 103 c, C= 1 – 2 – 3 + 4 + 5 – 6 – 7 + ... + 2008 + 2009 – 2010 – 2011 d, D= 1– 3 + 5 – 7 + ... + 2005 – 2007 + 2009 – 2011 e, E = ( – 10 ) . ( – 7 ) + ( – 15 ) . ( + 5 ) – (–3) mũ 2 Câu 5: Đặt dấu ngoặc một cách thích hợp để tính các tổng đại số sau: a, 942 – 2567 + 2563 – 1942 b, 13 – 12 – + 11 + 10 – 9 + 8 – 7 – 6 + 5 – 4 + 3 +2–1 Câu 6: Cho S1= 1 + ( – 3 ) + 5 + ( – 7 ) + ... + 17 S2= ( –2 ) + 4 +(– 6) + 8 + ... + ( – 18 ) Tính S1 + S2 Câu 7 : Chứng minh đẳng thức . –(–a+b+c)+(b+c–1)=( b – c + 6)–(7 – a + b )+c Câu 8 : Cho A=a+b–5; B=–b–c+1 C=b–c–4; D=b–a Câu 9 : Ba số tự nhiên liên tiếp có tổng bằng –9.hỏi tích của chúng bằng bao nhiêu?

Bài 12: Chọn và ghép cụm từ ở cột A với cột B sao cho tạo thành câu mệnh lệnh hoàn chỉnh, sau đó viết lại câu: A B 1. Don’t accept a. the door to Mike 2. Brush your teeth b. to bring the CDs 3. Turn off the light c. candies from strangers 4. Don’t step d. before you go to bed 5. Bring your dictionaries e. adult programmes 6. Don’t open f. when you go to bed to save energy 7. Don’t watch g. for languauge arts class 8. Don’t forget h. on the lawn

Nhờ mấy bạn chuyên tiếng anh giải dùm :(( mình sắp nộp zồi huhu

I. Fill in the blanks with the correct preposition: 1. Are you interested …….. protecting the environment ?. 2. We can look ….…information on recycling things in the local library. 3. Vegetable matter is made ……. compost. 4. These bags are made ……. cloth. 5. What did the government do to prevent people …… throwing drink cans ? II. Underline the best answer: 1. Farmers collect household and garden waste to make (glassware/ fabric/ compost) 2. You can (look for/ take out/ break up) information on recycling things in the library. 3. Milk bottles can be (recycled/ broken/ reused) after being cleaned. 4. We are looking forward (to see/ seeing/ to seeing) you in June. 5. These shoes are made (of/ from/ by) old car tires. III. Complete the sentences, using "adjective+ to infinitive ": Ex: It/ lovely/ see/ you/ again. -> It is lovely to see you again. 1- I/ too execited/ do/ anything. .................................................................................................... 2- Lan / glad / see / her old friend again. .................................................................................................... 3- The students / worried / hear / the new information. .................................................................................................... 4- She / strong enough / carry / all those heavy bags. .................................................................................................... 5- Ba /delighted / receive / his close friend's letter. .................................................................................................... IV. Choose the word that has the underlineddifferently from the others. 1. a. bag b. sandal c. waste d. matter 2. a. mix b. pipe c. deposit d. refill 3. a. lung b. difflcult c. natural d. mixture 4. a. reader b. heavy c. clean d. mean 5. a. reused b. returned c. mashed d. cleaned

: Một viên đạn có khối lượng 14g bay theo phương ngang với vận tốc 400 m/s xuyên qua tấm gỗ dày 5 cm, sau khi xuyên qua gỗ, đạn có vận tốc 120 m/s. Tính lực cản trung bình của tấm gỗ tác dụng lên viên đạn?

hãy chỉ ra sự thay đổi tính nết của dế mèn

Giúp mk làm bài nhé này nha mk đang cần gấp Mk vote cho 5* Và CTLHN

đây là bài làm giọng nói thụ động mong mn giúpđỡem sự giúp đỡ của mn là sự vinh hạnh ạ 1. The chief engineer was instructing all the workers of the plant. -> All the workers of the plant.... * 2. Somebody has taken some of my books away. ->Some of my books ..... * 3. They will hold the meeting before May Day. -> the meeting.... * 4. They have to repair the engine of the car. -> The engine of the car... * 5. The boys broke the window and took away some pictures. -> The window... * 6. People spend a lot money on advertising everyday.-> A lot money... * 7. They may use this room for the classroom.-> This room... * 8. The teacher is going to tell a story. -> A story.... * 9. Mary is cutting the cake with a sharp knife. -> The cake.... * 10. The children looked at the woman with a red hat. ->The woman with a red hat...... * 11. They have provided the victims with food and clothing. -> The victims .... * 12. People speak English in almost every corner of the world. -> English.... * 13. You mustn't use this machine after 5: 30 p.m. -> This machine...... * 14. You must clean the wall before you paint it. -> The wall.... * 15. They told the new pupil where to sit.-> The new pupil.... * 16. They told him of the meeting. -> He.... * 17. No one believes his story.-> His story.... * 5 points 18. A sudden increase in water pressure may break the dam.-> The dam... * 19. We must take good care of books borrowed from the library. -> Books borrowed from the library.... * 20. A man I know told me about it. ->I.... *