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Tảo có vài trò j đối vs con người và các sinh vật khác?

Rewrite the second sentence so that it has the same meaning as the first one 1. Listening to English songs is very interesting to me. → I find it ___________________________________________________________________ 2. Yesterday the thieves stole everything in it. → Yesterday everything in it ____________________________________________________ 3. Nobody in the class plays chess better than Christina. → Christina __________________________________________________________________ 4. . When did you buy the computer? → How long is ________________________________________________________________ 5. It takes me an hour to do my homework every evening. → I spend ____________________________________________________________________

50.680= 123.56= 65.8= 90.608= 90.9=

Cho ΔABC cân có AB = AC = 5cm, BC = 8cm. Kẻ AH vuông góc BC (HBC) a. Chứng minh: HB = HC.

Tính gtrị biểu thức : A = $\frac{x-5}{\sqrt{x-2}-1}$ tại x = 9 - 4$\sqrt{3}$ B = $\sqrt{4(1+6x+9x^2)^2}$ tại x = -$\sqrt{2}$ C = 4x - 7 + $\frac{\sqrt{x^3+3x^2}}{\sqrt{x+2}}$ tại x = -$\sqrt{2}$ D = $\frac{1}{\sqrt{x+2\sqrt{x-1}}}$ + $\frac{1}{\sqrt{x-2\sqrt{x-1}}}$ Tại x = 10

Find out one mistake in each sentence , then underline and correct it. 1. Does Nam have less stamps than Viet. 1. 2. When I saw her, I thought she looked happily. 2. 3. It takes Huy three hours doing this homework everyday. 3. 4. How many does it cost to send this letter to China? 4. 5. There was only a few people at the meeting last night. 5. 6. They told we to come and see them when we had time. 6. 7. Measles are one of the infections diseases that children get. 7. 8. Each students has answered the first three questions. 8. 9. It is a two- hours journey from London to Bristol. 9. 10. Jane is the most beautiful of the twins. 10.

Khi trung hòa V lít dd hỗn hợp HCl 1M và H2SO4 0,5M cần dùng 200 ml dd hỗn hợp NaOH 2M và KOH 1M. Khối lượng muối khan (gam) thu được khi cô cạn dung dịch sau phản ứng là

một mảnh đất hình chữ nhật có nửa chu vi là 120m. chiều dài bằng 70m. trên mảnh đất người ta xây bồn hoa hình vuông thì diện tích còn lại là 3451m vuông. a. tính diện tích hình chữ nhât, b. tính cạnh bồn hoa

Give the correct forms of words in the bracket . 1. Would you please give me some _________ about the train, please? (INFORM) 2. Mr. Anderson is my_________ .He has a lot of factories. (EMPLOY) 3. There are many ___________ events at the site of the festival (CULTURE) 4. During his ¬¬¬¬¬¬_________ the family used to live in the country side. (CHILD) 5. On a _________ day, we have to learn 4 hours with different subjects. (TYPE) 6. I have___________ time to play than my friends. (LITTLE) 7. I find horror films really__________ and not at all fun to watch. (FRIGHTEN) 8. There were three __________ in the festival. (COMPETE) 9. ___________, the step mother was cruel to Little Pea. (FORTUNE) 10. Every week there is one _________from Hanoi to HCM city. (FLY) 11. Mrs. Brown lives alone in __________. (POOR) 12. It is _________ of motorists to drink and drive. (RESPONSE)