Có bao nhiêu số phức $z$ thỏa mãn $\left|z-2+i\right|=2$ và $\overline{z}-i$ là số thực?

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Một số câu hỏi khác có thể bạn quan tâm.

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

  spirit                       despite                     animal                  disturb

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

  Your typewriter has been fixed and you can pick him up any time.

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

  In spite interruption, she was still able to finish her assignment before class.

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

  type                     geography                  economy                    ecosystem

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

  If I don't like you, I wouldn't invite you to my house.

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

  There has been six cases of the disease so far in this hospital.

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

  That car was such unreliable that they hardly ever drove it.

• Choose a word that has different stress pattern:

  biosphere                      contribute                      authority                       heritage

• Choose a word that has different stress pattern:

  environment                            diversity                         establishment                           invitation

• Choose a word that has different stress pattern:

  animal                             solution                                  interest                                 visitor