Khoảng có đạo hàm cấp hai nhỏ hơn không của hàm số được gọi là khoảng lõm của hàm số, vậy khoảng lõm của hàm số  là:  

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Một số câu hỏi khác có thể bạn quan tâm.

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

  He’s very busy at the moment, but he would come to the party.

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

  You needn’t park right outside the hospital entrance. You’ll be in the way.

• Choose the best answer for the following sentence:

  Would you mind not __________________ the radio until I’'ve finished with this phone call?
   

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

  You really may stop worrying about your brother.

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

  Excuse me, must you mind helping me across the road?

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

  You mustn’t take flowers to your hostess if you don’t want to.

• Choose the best answer for the following sentence:

  They were fortunate _________________ from the fire before the building collapsed.
  
  

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

  The wine should have been opened about three hours before it is used.

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

  All travel arrangements must complete by June 17 .

• Choose the best answer for the following sentence:

  The mouse family avoided __________________ by coming out only when the house
  was empty and the two cats were outside.