Hàm số $y=2x^4+4x^2-3$ nghịch biến trên khoảng nào dưới đây?

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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:

  leaves              pitches           ranges              places

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

  pasture             acquaintance              constant               talkative

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

  uncertain               tell                pursuit                picture

• Choose the best answer for the following sentence:

  My friend often shows her ______________ whenever I have troubles.
   

• Choose the best answer for the following sentence:

  Daisy is so ____________. She only cares about herself, not about other people.
   

• Choose the best answer for the following sentence:

  John left a _______________ impression on me. I will never forget him.
  
  

• Choose the best answer for the following sentence:

  Two friends should be loyal _____________ each other.
   

• Choose the best answer for the following sentence:

  The teacher never lets us ______________out when _______________.
   

• Choose the best answer for the following sentence:

  Whenever I see an action film, I feel my heart ______________ strongly.
  
  

• Choose the best answer for the following sentence:

  He was the first _____________ the fire.