Cho dãy số $\left(u_n\right)$ có $u_n=-n^2+n+1$. Khẳng định nào sau đây là đúng?

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

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

  In Poland we are used to live in a cold climate.

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

  Despite of the heavy traffic, we arrived on time.

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

  window                     flow                     know                       now

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

  off                    of                       safe                         knife

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

  durian                  during                     dull                        cucumber

• Choose a word that has different stress pattern:

  agency                    astronaut                       adventure                    canister

• Choose a word that has different stress pattern:

  citizen                  collision                       delicious                      deposit

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

  I will like another cup of coffee, please!

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

  harm                    wash                         call                        talk

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

  perform                 series                     period                     stereo