Xét hàm số  với là  tham số thực. Gọi S là tập hợp tất cả các giá trị của sao cho với mọi số thực thỏa mãn . Tìm số phần tử của S.  

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Một số câu hỏi khác có thể bạn quan tâm.

• Dùng một lò xo để treo vật có khối lượng 300g thì lò xo dãn ra 2 cm, nếu treo thêm một vật có khối lượng 150g vào thì lò xo dãn ra một đoạn là bao nhiêu ?
  

• If something _______ your attention or your eye, you notice it or become interested in it.

• Sau khi đánh bại xâm lược nhà Lương (550), triệu Quang Phục lên làm vua, lấy hiệu là gì?
  
• Read the passage carefully and choose the correct answers
  What picture do you have of the future? Will life in the future be better, worse or the same as now? What do you hope about the future?
  Futurologists predict that life will probably be very different in 2050 in all the fields, from entertainment to technology. First of all, it seems that TV channels will have disappeared. Instead, people will choose a program from a 'menu' and a computer will send the program directly to the television.
  Today, we can use the World Wide Web to read newspaper stories and see pictures on a computer thousands of kilometers away. By 2050, music, films, programs, newspapers and books will come to us by computer.
  In what concerns the environment, water will have become one of our most serious problems. In many places, agriculture is changing and farmers are growing fruit and vegetables to export.  This uses a lot of water. Demand for water will increase ten times between now and 2050 and there could be serious shortages. Some futurologists predict that water could be the cause of war if we don't act now.
  In transport, cars running on new, clean fuels will have computers to control the speed and there won't be any accidents. Today, many cars have computers that tell drivers exactly where they are. By 2050, the computer will control the car and drive it to your destination. On the other hand, space planes will take people halfway around the world in two hours. Nowadays, the United States Shuttle can go into space and land on Earth again. By 2050, space planes will fly all over the world and people will fly from Los Angeles to Tokyo in just two hours.
  In the domain of technology, robots will have replaced people in factories. Many factories already use robots. Big companies prefer robots - they do not ask for pay rises or go on strike, and they work 24 hours a day. By 2050, we will see robots everywhere - in factories, schools, offices, hospitals, shops and homes.
  Last but not least, medicine technology will have conquered many diseases. Today, there are electronic devices that connect directly to the brain to help people hear. By 2050, we will be able to help blind and deaf people see and hear again. Scientists have discovered how to control genes. They have already produced clones of animals. By 2050, scientists will be able to produce clones of people and decide how they look, how they behave and how much intelligence they have.
  (Source: Cambridge English for Schools by Andrew Littlejohn, Diana Hicks)
  Question. What is the author’s attitude in paragraph 3?
  
• Lựa chọn đáp án đúng để điền vào những chỗ trống dưới đây sao cho phù hợp.
  . . . . . . . . . . . . . . . . . . . là sự tiêu dùng sức lao động trong hiện thực.
  

• It has been proposed that he _______the topic of his writing.

• What time do you start ______ work in the morning?

• Cho sơ đồ sau: NaCl → A →Na₂CO₃ →B →NaCl (với A, B là các hợp chất của natri). A và B lần lượt là ?        

• Cho hàm số với là tham số thực. Có bao nhiêu giá trị nguyên của tham số để hàm số có điểm cực trị ?  

• Phương trình :