giải pt : `5\sqrt{3x+1}=2.(x^2+2)`

Hòa tan hoàn toàn 10 g hỗn hợp gồm Al,Al2O3,Cu vào trong dd HCl 0,2M vừa đủ,sau phản ứng thu được dd A,đót nóng A trong không khí đến khối lượng không đổi cân nặng 2,75 gam. a)Tính phần trăm theo khối lượng của mỗi chất trong hỗn hợp đầu. b)Tính thể tích dd HCl 0,2 M đã dùng

She ......... in the kitchen at 7 PM tomorrow A will cook B is cooked C will be cooking D be cooking

Một hình chữ nhật có chu vi là 200 cm. Chiều dài hơn chiều rộng 20 cm. tính diện tích của hình chữ nhật đó. Bài này e ko bbieets :V

MzjsjzjjajshshshshsbBb,-=7@82929#8

Lm giúp mik nha mik cho 5 sao tym tym

Giúp mình với cảm ơn nhiều!

I. Rewrite the following sentences without changing the meaning. 1. Scientists have invented new devices to help people live a longer life. New devices 2. I don’t have enough time, so I can’t go on holiday this summer. If 3. The man had a broken leg. He tried to save his wife. In spite of 4. I can’t tell you because I don’t know the answer. If 5. The rescue workers evacuated the villagers in the flood to the safe place last night. The villagers in the flood 6. The students will provide aids for the homeless people tomorrow. Aids 7. The storm destroyed many houses in this village last week. Many houses 8. Did they give food to homeless people last year? Was 9. Although the weather was bad, the football match was not cancelled. Despite 10. They will be using a satellite to explore habitable planets in the next five months. A satellite 11. “May I talk with you for a while after you finish your work tomorrow?”, she asked me. She asked me 12. “When should I come to see you tomorrow?” Rose asked Denny. Rose asked Denny 13. Earthquakes and volcanoes have caused most of the natural disasters in that country Most of the 14. My son watches TV a lot, so he is short-sighted now. If ………………………………………………………………………………….. 15. He came to my house at 9 am. I went out for shopping at 8.30 a.m. By the time 16. Would you mind lending me your new laptop within 2 hours? May I 17. “Can you tell me something about Jupiter?”, the boy asked his sister. The boy asked his sister 18. “When will you finish this spaceship model?”, John asked Peter. John asked Peter 19. “When did you last dream about going into the space?” Mrs Van asked her son. Mrs Van asked her son 20. “My brother wants to become an astronaut in the future.”, said Mary. Mary said 21. “In the very near future, there will be flying cars.”, said my brother. My brother said 22. “Please turn down the radio for me”, said my father. My father asked……………………………………………..……………………… 23. The brave firefighter rescued him out of the fire. He 24. The earthquake has destroyed a big number of buildings in the city. A big number 25. Why didn’t they send an ambulance to US? Why wasn’t 26. People are donating a lot of clothes, food and drinks to support the victims of the flood. A lot of 27. Someone must take him to the hospital for an immediate surgery. He ……………………………………………………………………………………. 28. I started working for this company a year ago. I’ve ................................................................................................................................ 29. I haven’t eaten this kind of food before. This is the first ................................................................................................................ 30. Studying well is very important for all students. It’s ……………………………………………………………………

lm hộp k hiểu lên giải chi tiết dùng .............. ( giải có cả x và y nha )

chỉ ra ý nghĩa tư tưởng trong bài ca dao "trong đầm gì đẹp bằng sen" ( ngắn gọn ) em cảm ơn ạ