Cho dãy ($u_{n}$) xác định bởi $u_{n}=2.3^{n}$. Giá trị $u_{20}$ với mọi số nguyên dương n là :

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the correct sentence which is built from the words and phrases given:

  He / publish / spelling book / dictionary / changes / way / English was used in the USA.
  
  

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

  sometimes               badminton                   twice                      riding

• Choose the correct sentence which is built from the words and phrases given:

  Two days ago / I / buy / a CD-ROM of Cambridge Advanced Learner’s Dictionary / your shop / I still keep the receipt.
  
  

• Choose the correct sentence which is built from the words and phrases given:

  I / not install the program into my computer / I / take / the CD back / the shop / ask for another one.
  
  

• Choose the correct sentence which is built from the words and phrases given:

  Now / I would like / have a refund / change for a better one.
  
  

• Choose a word that has different stress pattern:

  bonus                breakfast                     hurry                    receive

• Choose a word that has different stress pattern:

  equipment                  continue               badminton                promotion

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

  likes                  ends                  gets                    walks

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

  punch                  lunch                  each                   ache

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

  resume                 install                      set                      security