gt của x để 1/[(x+1)^2+5] đạt gt lớn nhất

viết một đoạn văn miêu tả tâm trạng của Dế Mèn trước cái chết của Dế Choắt

chưa động từ trong ngoặc you. tim to the concert (train)

Mọi người giải giúp em vs ạ! Em sẽ đáng giá 5 sao! :D

Ex1 : Many people worked to create television. In 1862, Abbe Giovanna Caselli invented a machine called the Pantelograph. Caselli was the first person to send a picture over wires. By the 1880s, Alexander Graham Bell invented a machine that transmitted pictures and sound over wires. His machine was called the Photophone. The World’s Fair was held in Paris, France, in the year 1900. The first International Congress of Electricity was held at the World’s Fair. That was when the word television was first used - by a Russian named Constantin Perskyi. That name stuck, and is now shortened to "TV." At the beginning of TV history, there were several types of TV technology. One system was a mechanical model based on a rotating disc. (Rotating discs are discs that spin like CDs.) The other system was an electronic model. In 1906, Boris Rosing built the first working mechanical TV in Russia. In the 1920s, John Logie Baird in England and Charles Francis Jenkins in the United States demonstrated improved mechanical systems. Philo Taylor Farnsworth also showed an electronic system in San Francisco in 1927. His TV was the forerunner of today’s TV, which is an electronic system based on his ideas. Now TV is everywhere. Before 1947, there were only a few thousand televisions in the U.S. By the 1990s, there were televisions in 98% of American homes. 1.A system is a combination of... 2.The word television was first used in... 3.Who first sent a picture over wires? 4.Who invented the Photophone? 5.The best synonym for demonstrated is... Ex2 : Television is one of man’s most important means of communication. It brings pictures and sounds from (1) ........ the world into millions (2)........homes. A person with a television set can sit in his house and watch the President make a (3).........or visit a foreign country. He can see a war being fought and watch statemen try to bring about peace. Through television, home viewers can see and learn about people, places and things in (4)............lands. Television even takes its viewers out of this world. It brings them (5)........ of America’s astronauts as the astronauts explore outer space. 1.Choose the best answer for the blank numbered (2) in the reading passage 2.Choose the best answer for the blank numbered (5) in the reading passage 3.Choose the best answer for the blank numbered (4) in the reading passage 4.Choose the best answer for the blank numbered (1) in the reading passage 5.Choose the best answer for the blank numbered (3) in the reading passage

Tìm m để tập nghiệm của bất phương trình: (m^2 - 1)x^2 + 2(m+1)x + 3 > 0 là R

TEST2 Rewrite these sentences so that the meaning doesn’t change: 1. “I’m leaving here for Hue tomorrow.” She said. She said …………………………………………………………………… 2. “I must go now.” Said he. He said …………………………………………………………………….. 3. “Do you love playing volleyball, Mai?” Nam saked. Nam asked ………………………………………………………………… 4. “Can you swim, Minh?” asked Lan. Lan asked ………………………………………………………………….. 5. “Where are you working now?” he said to me. He asked me ……………………………………………………………….. 6. “Don’t waste water.” He said to us. He told ……………………………………………………………………… 7. “Please wait for me, Nam.” Le said. Le told ………………………………………………………………………. 8. “Why do you come here late?” she asked me. She asked me ………………………………………………………………... 9. “Would you like to come to the beach?” she said to me. She invited me ………………………………………………………………. 10. “Let’s use fewer plastic bags.” He said. He suggested ………………………………………………………………… 11. “I’m having a wonderful time here.” said Mary. Mary said ……………………………………………………………………. 12. “Do you like pop music?” Hoa told Maryam. Hoa asked ……………………………………………………………………. 13. “Are you having a nice day, Minh?” asked Ha. Ha asked ……………………………………………………………………… 14. “You shouldn’t stay up late.” She said to us. She advised …………………………………………………………………… 15. “Can you play the guitar, Hanh?” Hao asked. Hao asked ……………………………………………………………………

I, Multiple-choice: 1, Melodi is an avid artist whose favorite hobbies are _________ and sculpture. A. using paint B. to paint C. painting D. paint 2, Increasing the number of ferry crossings to the island from the mainland had the _________ effect of attracting more visitors. A. desirable B. desired C. desirability D. undesired 3, Such a tremendous noise was _________ in the banqueting-hall that there was little danger of their being overheard. A. happening B. going on C. continuing D. turning out 4, When the area was cleared for mining, the animals that had lived there were _________. A. driven out B. putting out C. continuing D. gotten out 5, As soon as the problem at work blew up, he instantly thought about how he could come out of it looking good. He is such a ____________ person. A. self-evident B. self-conscious C. self-centred D. selfless 6, When will it ____________ us that climate change poses one of the greatest risks to the survival of our planet? A. see that B. considered C. know that D. dawn on 7, Rock and roll in the 1950s was primarily a youth cult, but its lasting importance ____________ in the seismic impact. A. stood B. stayed C. held D. lay 8, His face is used to advertise products with intellectual ____________ from computers to encyclopaedias. A. suppositions B. connotations C. assumptions D. inferences 9, My two cousins were so excited at the start of the war, they ran downtown and ________ up immediately. A. wrote B. signed C. drew D. brought 10, Mathew is increasingly required to present internally to his colleagues ____________ externally to the major shareholders. A. let alone B. not to mention C. besides D. alongside

Em hãy viết một bức thư gửi các em nhỏ trong khu cách ly cùng người dân nước Việt để tạo thêm động lực vượt qua những ngày giông bão.

Thay x là số gà bằng x là số chó Giúp e với