Rút gọn biểu thức: a) √31² b) √(2-2√5)² - 2√5 c) √4a² + 2a d) √(a-3)² với a>3 e) √(4+2√3) + √3

Ex6: Complete the second sentences so that it has the same meaning as the first one. Don’t change the word given. 1. We will use waves as an environmentally friendly energy source. Waves…………….. 2. They will install a network of turbines to generate electricity. A network of turbines………… 3. I will turn off the lights when leaving a room or going to bed. The lights……………… 4. People in the countryside will increase the use of biogas for cooking. The use of……….. 5. We will use less biogas in the future. Less biogas……… 6. People won’t burn fossil fuels for energy in the future. Fossil fuels……….. 7. They will install solar panels on the roof of the house next week. Solar panels……………. 8. They often walk to the bus station. They often go……... 9. Is your bike red, Minh? Is the red……………. 10. These are Nam’s balloons. These balloons……………….

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Mọi người lm ơn giúp em bài này vs ạ ! Em cần gấp lắm rồi ạ ! Em cảm ơn

Giỏi toán giúp mk nha. Ko bt đừng vô balalaka

vẽ con mầm cute nhá nl:hóng idol

R\(2;dương vô cực) biểu diễn trên trục số

Cho tam giác ABC vuông tại A đường cao AH a, Biết AH=6cm ,BH=4,5cm. TínhAB,AC,BC,HC b,Biết AB=6cm, BH=3cm, Tính AH và chu vi các hình vuông trong hình

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VIII. Fill in each blank with the most suitable word to complete the text. The Browns live in the countryside. Last week when they came up to London, they …1… their times in seeing as much as …2… . Mrs Brown was most interested in stores, especially in Oxford Street, and bought some of …3… things which she could not find in the shops in the countryside. Their two children, George and Susan, …4… had never been to London before, were surprised …5… the crowds everywhere. They enjoyed travelling on the underground and going down the moving stairs …6… lead to the platforms. One day they went to Hyde Park and walked along on the grass to Kensington Garden …7… the bright autunm sunshine. It was very quiet here. Only …8… noise from the streets reminded them that they were still in a city. The …9… of the tall trees were turning red, brown and yellow, birds were …10… about, sheep …11… eating the grass, there were …12… of flowers, and ducks were swimming about on the Round Pond. George, …13… hobby was planes and boats, was very much interested in the model boats which boys were sailing …14… the Pond. Before the end of the week they had seen a great …15… . They hoped, however, to see more of London on their next visit. IX. Rewrite the following sentences with suggested words. 1. It’s such a pity your sister can’t come as well. If only............ 2. The house seemed to have been occupied for several months. It looked........... 3. He was so tired that he fell asleep before the end of the film. He was too.………………………………....... 4. Everyone heard about the accident before I did. I was the.......…………………………………. 5. Keeping the environment clean is very important. It’s………………………………………….… 6. He didn’t attend the seminar simply because he was not informed. If...........……………………………………..... 7. Although I’m short of money, I’ll lend you some. In spite of ………………………………………. 8. “Don’t swim out too far, boys” I said. I warned..........……………………………..... 9. She forgot to add salt, so the food was tasteless. If she hadn’t forgotten ......……………............ 10. What a shame you didn’t tell me earlier. If only...........………………………………..... II. Cho dạng đúng của động từ trong ngoặc. (2ms) 1. When my brother and I (be).....................................................children, we (have).........................................................two cats and a dog. 2. It's 8.00 now. We (learn).............................................................math. At 9.00, we (have).........................................................a history class. 3. Lien's brother is an architect but he (not work).............................at the moment. 4. How much it (cost)......................................... to mail a letter to England? 5. We are decorating our house because we (have).......................a birthday party tonight. 6. They (travel).................................................to the USA next month 7. Would you like me (help)..............................you with your homework tonight? 8. My sister gets used to (go).....................................out on Saturday nights. IV. Cho dạng đúng của từ trong ngoặc. (1m) 1. My sister has a big.....................................................of stamps. (Collect) 2. My favorite subject at school is physical........................................ (educate) 3. The most popular............................................at recess is talking. (act) 4. What a......................................................................picture! (wonder) 5. I live in a........................................................house by the sea. (Love) 6. My friend and I write to each other.............................................. (regular) 7. Guitar is a..............................................................instrument. (music) 8. I have............................................time to play than my friends do. (little) 9. You should do morning exercises to have a.................................body. (health) 10. Where is the.............................................................restaurant? (near)