Tìm hệ số chứa  trong khai triển  với  là số tự nhiên thỏa mãn .  

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  ________________ customers are softened up with free gifts before the sales talk.
   

• Choose the best answer for the following sentence:

  We wanted to see the action, but they made us get __________ .
   

• Choose the best answer for the following sentence:

  He left that job because the boss always kicked him _________ .
   

• Choose the best answer for the following sentence:

  She was a good mother; she did well ____________ her children.
   

• Choose the best answer for the following sentence:

  Don't take him ___________ a fool; he is really quite smart.
   

• Choose the best answer for the following sentence:

  If you are looking for volunteers, count me _________.
   

• Choose the best answer for the following sentence:

  He wrote __________ his sister when she got into trouble.
   

• Choose the word that has the underlined part pronounced differently from the rest:

  advocate                pioneer                  involvement                  philosopher

• Choose the word that has the underlined part pronounced differently from the rest:

  rubbish                  struggle                   tsunami                sculpture

• Choose the word that has the underlined part pronounced differently from the rest:

  civilization                              intellectual                                epidemic                                     discriminate