1san bong da lắp cỏ nhân tạo hình chữ nhật có chiều dài x (m )chiều rộng y(m) in tiền công lát một mét vuông có nhân tạo là 450000₫ như vậy chi phí để lát toàn bộ sân bóng đá bằng cỏ nhân tạo là bao nhiêu

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1.Hiđro không phản ứng được với chất nào sau đây? A: MgO. B: Cl2 C: CuO D: O2 2 Có thể thu khí oxi bằng phương pháp đẩy nước. Đó là vì A: khí oxi ít tan trong nước. B: khí oxi nặng hơn không khí. C: khí oxi không màu, không mùi. D: khí oxi hóa lỏng ở -183o C. 3 Dãy nào sau đây gồm các chất đều là oxit bazơ? A: SO2 , CO2 , CO, P2 O5 . B: MgO, NaOH, H2 O, Al2 O3 . C: Al2 O3 , CaO, MgO, Na2 O, CO. D: FeO, CaO , MgO, Na2 O. 4 Cho 50 gam hỗn hợp gồm Al, Mg và Zn tác dụng vừa đủ với V lít khí O2 (đtkc). Sau phản ứng thu được 74 gam hỗn hợp sản phẩm. Thể tích khí oxi (đktc) đã tham gia phản ứng với hỗn hợp trên là A: 16,8 lít. B: 11,2 lít. C: 22,4 lít. D: 13,44 lít. 5 Chất nào sau đây không dùng để điều chế khí oxi? A: KClO3 . B: H2 O. C: KMnO4 . D: CO2 . 6 Cho 6,72 lít khí H2 (đktc) tác dụng vừa đủ với Fe2 O3 đun nóng, giả sử phản ứng chỉ tạo thành kim loại. Khối lượng Fe tạo thành sau phản ứng là A: 5,6 (g). B: 11,2 (g). C: 22,4 (g). D: 16,8 (g). 7 Phản ứng hóa học nào sau đây viết đúng? A: 2 H 2 + O 2 t o → 2 H 2 O B: Cu+ O 2 t o → 2CuO C: 2C+ O 2 t o → CO D: Al+ O 2 t o → A l 2 O 3 8 Dãy nào sau đây gồm tất cả các chất là muối? A: NaHCO3, Mg(OH)2, CuSO4. B: FeCl3, H2O, BaSO4 C: KCl, ZnS, NaH2PO4. D: NaCl, CaCO3, H2SO4. 9 Dãy nào sau đây gồm tất cả các chất là bazơ? A: NaOH, KOH, Fe(OH)2 . B: KOH, Ca(OH)2 , FeCl3 . C: CaO, CaCl2 , Ba(OH)2 . D: C2 H5 OH, Ca(OH)2 , H2 SO4 10 Nhận xét nào sau đây là đúng? A: Nước tác dụng với tất cả các kim loại ở nhiệt độ thường. B: Trong nước C: Nước không cần cho nông nghiệp, công nghiệp, đời sống... D: Nước hòa tan được nhiều chất như đường kính trắng, cát, muối.

Giair hết không mình báo ad nha I. Choose the best answer to the following questions. 1. International school in Ho Chi Minh City is the ______ school in Vietnam with high-tech facilities. A. oldest B. youngest C. most historic D. most modern 2. My family had a lot of ______in Hoi An and it was an exciting trip. A. fun B. funny C. enjoy D. enjoys 3. That city is most famous______ its fashion shops. A. to B. with C. for D. of 4. Nha Trang has an ________atmosphere of young, _________ city. A. exciting – growing B. exciting – grown C. excited – grow D. excited – growing 5. Do you have __________ in Da Lat during your holiday? A. time B. good time C. a good time D. good a time 6. I have been to Nha Trang _________. How about you? A. one B. two C. two times D. twice 7. Britain’s most common __________ activities are watching TV and films and listening to the radio. A. free B. leisure C. good D. popular 8. Big Ben is the most famous ___________ in England. A. tower B. waterfall C. city D. river II. Put the verbs in the brackets in the Present Perfect tense. 9. I (have)_________ this bike since I was a teenager and I still use it. 10. The weather (be)_________ quite good since Christmas. 11. I (study)_________ very hard for this examination. 12. He (play)_________ for the football club for several years, but it’s time to leave it now. 13. Mike and his brother (learn)_________ English for three years. 14. Mr. Brown (play)_________ chess since eight o’clock. 15. It (not rain)_________ since last week. 16. We (not see)_________ our new teacher yet 17. My aunt (work)_________ in this hospital for eleven years. 18. She (see)_________ the film before. 19. Hoa (walk)_________ in the rain many times. She loves it! 20. He (never meet)_________ her before.

I. Change these sentences into the passive voice: 1. Miss Hien Trang teaches history.  History ____________________________________________. 2. John will deliver the letter.  The letter __________________________________________. 3. Bell invented the telephone.  The telephone ______________________________________. 4. My brother took the photo.  The photo _________________________________________. 5. They will open the new hospital.  The new hospital ___________________________________. 6. Mr Brown wrote the report yesterday  The report ________________________________________. 7. They clean the streets every day.  The streets _______________________________________. 8. We paint our house every four years.  Our house ______________________________________. 9. They dry the glass pieces completely.  The glass pieces _________________________________. 10. They will plant trees and flowers in the school garden.  Trees and flowers ________________________________. II. Write sentences with it and an adjective followed by to infinitive 1. Buy a Complex computer. It isn't expensive  It isn't expensive to buy a Complex computer. 2. Using the computer is simple  It is _________________________________. 3. Learning Spanish is difficult.  It’s __________________________________. 4. Keeping the environment clean is important.  It is __________________________________. 5. Getting a good job is difficult.  It is ____________________________________. III. Combine each pair of the sentences, using the adjective + noun clause 1. I can't go to Vung Tau with you. I'm sorry.  I’m sorry that I can’t go to Vung Tau with you. 2. I was very happy. I got good grades this semester. à I was very happy that_________________________. 3. He knows the answer. He is delighted. à He is delighted that_________________________. 4. We saw you in town. We were surprised. à We were surprised that_________________________. 5. They passed the entrance examination. They were very happy. à They were very happy that_________________________. 6. You didn't pass the English exam. Your parents were very disappointed. à Yourr parents were very disappointed that_________________________. MN ƠI GIÚP MK VS AK... MK ĐANG CẦN GẤP :)