Với mọi giá trị dương của m phương trình  luôn có số nghiệm là        

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  The headmaster disapproved ____________ his behaviour.
  
  

• Choose the best answer for the following sentence:

  He was offered the job ____________ he had no experience.
  
  

• Choose the best answer for the following sentence:

  I'll have to do overnight tonight, ______________ is very tiresome.
   

• Choose the best answer for the following sentence:

  The couple invited all their relatives and friends to their ___________ .
  
  

• Choose the best answer for the following sentence:

  This _____________ is best served with boiled rice and a crisp green salad.
  
  

• Choose the best answer for the following sentence:

  I'd be able to lead the way if _________ .

• Choose the best answer for the following sentence:

  ______________ while Joan was doing the housework.
  
  

• Choose the best answer for the following sentence:

  He said that it wasn’t raining that day ______________ .
  
  

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

  If you left the milk out of the fridge in this weather, it’ll go off.

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

  Far more money is being spent on food than spent ten years ago.