Cho dãy số $\left(u_n\right)$ xác định bởi $\left\{\begin{array}{l}{u}_1=321\\ u_{n+1}=u_n-3\end{array}\right.$ với mọi $n\ge 1$. Tổng của 125 số hạng đầu tiên của dãy số $\left(u_n\right)$ bằng

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  The baby __________________.
   

• Choose the best answer for the following sentence:

  They ______________________ by the sea.
  

• Choose a word that has different stress pattern:

  water                   football                     begin                  meter

• Choose a word that has different stress pattern:

  personal                     penalty                      defensive                  vertical

• Choose a word that has different stress pattern:

  award                     prevent                    visit                 except

• Choose a word that has different stress pattern:

  goalie                    advanced                    above                   depend

• Choose a word that has different stress pattern:

  overtime                        decision                      period                    penalize

• Choose the best answer for the following sentence:

   Water polo is played in __________ pool 1.8 meters deep.

   

• Choose the best answer for the following sentence:

   The final _____________ was 3-0.

   

• Choose the best answer for the following sentence:

   The referee’s ______________is the most important in any sport competition.