Cho hàm số  có đồ thị như hình vẽ. Tính  .                                        

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  Putting your thumb and ringing finger together, kissing your thumb and moving your hand away from your face is a way of ____________ that something is perfect.
   

• Choose the best answer for the following sentence:

  When you are on the road, always consult the signpost which _____________ the right way to go.
   

• Choose the best answer for the following sentence:

  Stay away from him when he is ___________ with fury. He is not himself and loses his control easily.
   

• Choose the best answer for the following sentence:

  Please don't mind. It's my ____________ to help you whenever you want.
   

• Choose the best answer for the following sentence:

  My mother is a caring woman and always _____________ of others.
   

• Choose the best answer for the following sentence:

  Only by _____________ for the exam carefully can you earn good mark and come up to your parents' expectations.
   

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

  Facial expression involves some of smallest body movements, but its impact may be greater than any other body language.

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

  Smiles and grimace can be very effective used in conversation, but more commonly, we do not tend to think that nonverbal physical response may be communicating.

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

  Teachers often use eye contact in the classroom to decide who is prepared to answer a question, or that didn’t complete his homework assignment.

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

  Beside words the human face is the primary source of information for express an individual’s internal feelings.