Cho cấp số cộng  có số hạng tổng quát là . Tìm công sai d của cấp số cộng.        

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  I couldn’t decide between the two records, so I bought ____________ of them.
  
  

• Choose the best answer for the following sentence:

  Have you told ____________ about the letter?
  
  

• Choose the best answer for the following sentence:

  I would never borrow money from ____________ .
  
  

• Choose the best answer for the following sentence:

  The boy said that he hadn’t done ____________ wrong.
  
  

• Choose the best answer for the following sentence:

  He asked me if I had seen his wife _____________ .
  
  

• Choose the best answer for the following sentence:

  _____________ couldn’t understand what she was saying.
  
  

• Choose the best answer for the following sentence:

  Tell me if you see ___________ unusually.
  
  

• Choose the best answer for the following sentence:

  ___________ is ready for the party.

• Find a mistake in the four underlined parts of the sentence and correct it:

  I asked the salesman if I could change the faulty camera with another one.

• Find a mistake in the four underlined parts of the sentence and correct it:

  Let’s go to the airport now just in case her plane will arrive early.