Với mọi , dãy số  nào sau đây không phải là cấp số cộng hay cấp số nhân?  

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Một số câu hỏi khác có thể bạn quan tâm.

• He is one of the most _______ bosses I have ever worked with. He behaves rudely to not only me but also others in the staff.

• No sooner___________ out than it rained.

• Biểu hiện nào dưới đây không nói về lòng yêu nước?
  
• Read the passage carefully and choose the correct answers
  History books record that the first film with sound was The Jazz Singer in 1927. But sound films, or "talkies", did not suddenly appear after years of silent screenings. From the earliest public performances in 1896, films were accompanied by music and sound effects. These were produced by a single pianist, a small band, or a full-scale orchestra; large movie theatres could buy- sound-effects machines. Research into sound that was reproduced at exactly the same time as the pictures – called "synchronized sound" – began soon after the very first films were shown. With synchronized sound, characters on the movie screen could sing and speak. As early as 1896, the newly invented gramophone, which played a large disc carrying music and dialogue, was used as a sound system. The biggest disadvantage was that the sound and pictures could become unsynchronized if, for example, the gramophone needle jumped or if the speed of the projector changed. This system was only effective for a single song or dialogue sequence. In the "sound-on-film" system, sounds were recorded as a series of marks on celluloid which could be read by an optical sensor. These signals would be placed on the film alongside the image, guaranteeing synchronization. Short feature films were produced in this way as early as 1922. This system eventually brought us "talking pictures".
  Question. According to the passage, films using sound effects were screened______
  
•  Lòng yêu nước bắt nguồn từ những tình cảm bình dị và gần gũi nhất đối với con người như
  
• Năm 907 diễn ra sự kiện nào dưới đây
  

• The judge sentenced the thief to six months in ______ prison.

• Lực đàn hồi không có đặc điểm nào sau đây:
  

• Hỗn hợp X gồm Na, Al, Na₂O và Al₂O_3. Hòa tan hoàn toàn 20,05 gam X vào nước, thu được 2,8 lít khí H₂ (đktc) và dung dịch Y. Thêm từ từ dung dịch HCl 1M vào Y, đến khi bắt đầu xuất hiện kết tủa thì dùng hết 50ml, nếu thêm tiếp 310ml nữa thì thu được m gam kết tủa. Giá trị của m là:

• Giải phương trình ta được: