Gọi n là số mặt phẳng đối xứng của hình bát diện đều. Tìm n.  

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose one sentence that has the same meaning to the root one:

  He last had his eyes tested a year ago.
  
  

• Choose one sentence that has the same meaning to the root one:

  The milk was too sour to drink.
  
  

• Choose one sentence that has the same meaning to the root one:

  I like to play tennis in the summer.
  
  

• Choose the best answer for the following sentence:

  I want to teach ____________ to the children in SOS village in summer.
  
  

• Choose the best answer for the following sentence:

  He has a good sense of __________ so his stories always make us laugh.
   

• Choose the best answer for the following sentence:

  He has the __________ to overcome this tragic ending.
   

• Choose the best answer for the following sentence:

  Most children in special classes in SOS village are mentally __________.
   

• Choose the best answer for the following sentence:

  I love living in my house because its ____________ provide a lot of fresh air.
  
  

• Choose the best answer for the following sentence:

  Maria has spent all her life looking ___________ the sick in this hospital.
  
  

• Choose the best answer for the following sentence:

  Susan: “Which lower-secondary school did you go to?” / Nga: “ _____________.”