Cho cấp số cộng $\left(u_n\right)$. Đặt $S_n=u_1+u_2+u_3+... +u_n$.

Khi đó câu sau đây đúng là

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose a word that has different stress pattern:

  manage            morning            runner             reserve

• Choose a word that has different stress pattern:

  acquire          direct               member             result

• Choose a word that has different stress pattern:

  captain            explain            favor            tourist

• Choose a word that has different stress pattern:

  nature             plenty                resign             season

• Choose a word that has different stress pattern:

  entire               neither              return            release

• Choose a word that has different stress pattern:

  argument              comedy                 magical                successful

• Choose a word that has different stress pattern:

  collection            disaster            musical            production

• Choose a word that has different stress pattern:

  amazing            gallery             investment             regretful

• Choose a word that has different stress pattern:

  grateful           moment               public              reveal

• Choose a word that has different stress pattern:

  atmosphere           enormous            historic            recover