Khi xe đạp xuống dốc, chúng ta có thể tăng được tốc độ của xe kể cả khi không cần đạp xe. Điều này có vi phạm định luật bảo toàn năng lượng hay không? Vẽ sơ minh họa và giải thích vấn đề trên.

Cần giúp gấp !!!!!!!!!!!!!!!!!!

Mn giúp với ạ. Mik đag cần gấp mik cảm ơn

Nếu bạn nào giải được mình sẽ cho bạn ấy là câu nhanh nhất và hay nhất nha ! III. Dùng từ gợi ý , viết thành câu hoàn chỉnh ở thì Hiện tại tiếp diễn. 1. They/ play/ soccer/ at present. 2. She/listen/ music/ in room. 3. My sister/ read/ book/ her room. 4. My mother/ work/ in the garden/ now 5. Nga and Phuong/ watch/ TV/ now 6. - What/ she/ do/ at the moment? - She/ cook the dinner. 7. -Where/ you/ go/ now? - I/ go/ the post office. 8. - What/ the students/ do/ in the class/ now? - They/ talk. 9. He /do/his housework/ now? IV. Sắp xếp từ thành câu hoàn chỉnh 1. doing/ is/ mother/ what/ your? 2. An/ Hung /are/ what/ doing/ now/ and? 3. that/ Hanoi/ to/ going/ businessman/ is 4. truck/ is he/ driving/ his/ ?/ 5. waiting/ is/ who/ he/ for? 6. driving/ to /Quang/ is/ Hue. 7. vegetable/ the/ market/ to/ taking/ is/ he/ the. 8. Nha Trang/ the is/ train/ to/ going. 9. the garden/ the/ are/ children/ playing/ in. 10. brushing/ teeth/ Mai/ her/ is. V. Chia động từ trong các câu sau ở thì hiện tại đơn hoặc thì hiện tại tiếp diễn. 1. Thu (go) to school by bike every day. 2. This house (have) a big garden. 3. What you (do) now? - I (unload) the vegetables. 4. She (live) in a small village. 5. I (play) soccer every afternoon and I (play) soccer now. 6. They (not play) video games at the moment. They (do) their Math homework. 7. His mother (work) in the hospital. 8. There (be) a park near my house. 9. The farmer (go) to his farm every morning. 10. There (be) many trees in the garden. VI/ Present continuous. 1. I ____________ (learn) how to swim. 2. I ____________ (eat) my lunch. 3. I ____________ (watch) television. 4. She ____________ (read) a book. 5. Dad ____________ (bake) a cake. 6. My sister ____________ (listen) to music. 7. Peter ____________ (clean) his car. 8. The dog ____________ (bark) in the garden. 9. We ____________ (sing) our favourite song. 10. My brother and I ____________ (play) a computer game. 11. The teachers ____________ (show) us a film. 12. They ____________ (bring) a TV in the classroom. 13. She's bored. Her friend ____________ (watch) TV again. 14. Martin's excited. Chelsea ____________ (win) the match. 15. I'm scared. A big dog ____________ (stand) in front of me. 16. She's happy. She ____________ (not work) today. 17. I'm worried. It ____________ (rain) and I haven't got an umbrella. 18. The teacher is annoyed. We ____________ (not listen). 19. What ____________ you ____________ (wait) for? I'm ____________ (wait) for John. 20. ____________ it ____________ (snow)? No, it ____________ (rain). 21. What ____________ you ____________ (do) today? We ____________ (go) to the park. 22. ____________ you ____________ (listen) to me? No, I ____________ (listen) to the radio. 23. ____________ you ____________ (watch) TV? No, we ____________ (study). 24. What ____________ you ____________ (do)? I ____________ (do) my homework. 25. ____________ they ____________ (sleep)? Yes, they are. VII/ Fill in the blanks with the correct forms of the verbs in brackets to complete the sentences 1. Johnny ______________ (play) with his friends in the gym with his friends now. 2. Kayla ______________ (not do) her morning exercise now. She ______________ (sleep) in her bed. 3. The children ______________ (swim) in the river right now. I don’t think it is safe. 4. Hey Philip! Where ______________ you ______________ (go)? To the new amusement park? 5. ______________ Amber and Judy ______________ (ride) their bicycles at the moment? 6. Who ______________ (vacuum) the floor right now? I ______________ (try) to read my book here. 7. My mother ______________ (cook) steak and rice while my father ______________ (make) some fresh lemonade in the kitchen at the moment. 8. My grandfather ______________ (plant) an olive tree in the garden and I ______________ (watch) him. 9. Someone ______________ (knock) the door. Can you open it, please? 10. Alan and Beverly ______________ (pick) daisies for their grandmother in the meadow right now. Mình càn nhanh trước 3h chiều nay nhé !

1. After taking an aspirin, her headache………………….... (APPEAR) 2. My teacher usually …………………….me to take part in the ioe. (COURAGE) 3. We are waiting for the………………..…..of his plane. (ARRIVE) 4. He should read the…………………....well before using it. (INTRODUCE) 5. The scientists have………………..…..predicted the direction of the storm. (SUCCESS) 6. He would never do anything to…………………. the lives of children. (DANGEROUS) 7. These shoes are smart, but they are very………………….... (COMFORT) 8. Susan always dresses very……………………………… (FASHION)

$\frac{a^{2}-ab+b^{2}}{a^{2}-2ab+b^{2}}$ bằng bao nhiêu v mn

Vẽ quả táo cute, có nền táo Làm có tâm để tôi để avatar

phân tích đa thức thành nhân tử x^2-2x+1

Cali: Triệu phú timmm NL: Lên trịu phú tim r :D

Làm và ghi rõ cách đọc chữ đc gạch chân ( bài I ) và trọng âm của từ ( bài II ) giúp mình với ạ