Một miếng bìa hình tam giác đều , cạnh bằng . Học sinh Trang cắt một hình chữ nhật  từ miếng bìa trên để làm biển trông xe cho lớp trong buổi ngoại khóa (với  thuộc cạnh ; ,  lần lượt thuộc cạnh  và ) . Diện tích hình chữ nhật  lớn nhất bằng bao nhiêu?  

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  A friend needs ___________ honest.
  
  

• Choose the best answer for the following sentence:

  __________ can't people who are talkative keep a friend long?
   

• Choose the best answer for the following sentence:

  Can friendship which is all give on one side and all take on the other _________ long?
  
  

• Choose the best answer for the following sentence:

  Should two close friends understand each other so well that ________ can be no suspicion between them?
   

• Choose the best answer for the following sentence:

  Do you think your close friend should ___________ joy and sadness with you?
   

• Choose the best answer for the following sentence:

  I am very delighted ________ the letter from you.
   

• Choose the best answer for the following sentence:

  Please let me __________ your decision as soon as possible.
   

• Choose the best answer for the following sentence:

  How dare you ____________ my letter!
   

• Choose the best answer for the following sentence:

  He should know how ____________ the film projector.
   

• Choose the best answer for the following sentence:

  We don't want anybody __________ that we are here