Trong không gian với hệ trục tọa độ , cho ba điểm ; ; . Xét 4 khẳng định sau: I. .        II. Điểm thuộc đoạn . III. là một tam giác.        IV. , , thẳng hàng. Trong khẳng định trên có bao nhiêu khẳng định đúng?  

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  It was Ptolemy, a / an ______________, who propounded that the Earth was the center of the universe.

• Choose the best answer for the following sentence:

  The area ____________ New York to the south of Houston Street is known as Soho.

• Choose the best answer for the following sentence:

  England used to be the first ____________ country in Europe as well as in the world.

• Choose the best answer for the following sentence:

  The state is at least ___________ England.
  
  

• Choose the best answer for the following sentence:

  ______________ live in the capital than in the whole of the rest of the country.
   

• Choose the best answer for the following sentence:

  It was ____________________ I had expected.
   

• Choose the best answer for the following sentence:

  He finds physics ________________ other science subjects.
   

• Choose the best answer for the following sentence:

  London has ______________ the rest of the country.
   

• Choose the best answer for the following sentence:

  He used to smoke ______________ a day.
   

• Choose a word that has different stress pattern:

  temple                    palace                     event                    ancient