Xét khối tứ diện có cạnh và các cạnh còn lại đều bằng . Tìm để thể tích khối tứ diện đạt giá trị lớn nhất .         

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

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

  "I have lost my passport," said Mary.
  
  

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

  I was the last to know about the accident.
  
  

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

  Mr. Pike wants his wife to quit her job and stay home with the children.
  
  

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

  I do apologize for my forgetting your birthday.
  
  

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

  My mother never allows me to go out alone at night.
  
  

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

  choose                  child                   change                  chemistry

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

  main                  certain                  complain                  explain

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

  Africa                   hat                    ache                 man

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

  job                      chosen                       chop                      pot

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

  smooth                    book                     good                    look