Một hộp không nắp được làm từ một mảnh các tông theo hình vẽ. Hộp có đáy là một hình vuông cạnh , chiều cao là và thể tích là . Tìm độ dài cạnh hình vuông sao cho chiếc hộp làm ra tốn ít bìa các tông nhất.           

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  The boy said that he hadn’t done ____________ wrong.
  
  

• Choose the best answer for the following sentence:

  He asked me if I had seen his wife _____________ .
  
  

• Choose the best answer for the following sentence:

  _____________ couldn’t understand what she was saying.
  
  

• Choose the best answer for the following sentence:

  Tell me if you see ___________ unusually.
  
  

• Choose the best answer for the following sentence:

  ___________ is ready for the party.

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

  I asked the salesman if I could change the faulty camera with another one.

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

  Let’s go to the airport now just in case her plane will arrive early.

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

  The library is divided in two sections.

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

  She apologized and said that she won’t do it again.

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

  She said the doctor that she was unable to sleep.