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)

giúp em với ạ em sẽ cho ctlhn ạ

Giải dùn bài toán này với ạ cần gấp

Give the correct form of the verbs in brackets. 1. Do you want to read comics?. No, thanks. I like (watch) _________ films now. 2. I hope you (visit) _________ Hanoi next summer vacation. 3. We haven’t seen Nick since we (leave) _____________ the secondary school. 4. The first festival (hold) _____________ nearly eight hundred years ago. 5. My son is interested in (take) ______________ to the zoo every Sunday. 6. Mrs White used to (swim) ________ once a day when he was young. 7. David (not hand) __________ in his assignment yet. 8. It started raining when we (play) _____________in the garden. 9. A little girl can’t spend all her time (listen) __________to stories. 10. I wish the neighbor’s dog would stop (bark) _________. 11. We (visit) ___________the museum at the moment. 12. That bridge (rebuild) __________ in 2005. 13. It’s ten years since I last (see) ________her.

1. will/flying/There/by/be/cars/the year/2030. 2. travel/How/people/in/will/2050? 3. Will/people/driverless/in the/cars/use/future? 4. we/Can/it/use/bad/in/weather? 5. Flying/use/will/solar/cars/power. 6. means/These/avoid/of/will/transport/traffic jams. 7. will/less/fossil fuels/We/use/in the future. 8. I think/won’t/modern/vehicles/save energy. 9. will/More/travel//people/by/flying trains. 10. Many/on/run/won't/in the future/vehicles/fuel.