Trong không gian với hệ tọa độ , gọi  là hình chiếu của  lên đường thẳng  có phương trình là . Tìm tọa độ điểm

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Một số câu hỏi khác có thể bạn quan tâm.

• Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction in each of the following questions:

   On (A) the floor of the Pacific Ocean is (B) hundreds of (C) flat-topped mountains more than (D) a mile beneath sea level.         

• Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction in each of the following questions:

  Drying (A) food by means of (B) solar energy is an ancient process applying (C) wherever climatic conditions make it possible. (D)         

• Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions:

  Most bacteria has strong cell walls much like those of the plants.         

• Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions:

  It’s thirty years since this thirty-storeys building was built.         

• Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions:

  Each of the students in the accountant class has to type their own research paper this semester.  

• Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions:

  Body language is quiet and secret, but most powerful language of all.  

• Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions:

  Stayed strong, family members have to be engaged in each other’s lives.          

• Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions:

  Once you can overcome your difficulty, the problem may well become a source of strengthen to your marriage and your faith.         

• Circle the letter A, B, C or D to indicate the underlined part that need correction in each of the following questions:

  Because vitamins are contained in a wide variety of foods, people seldom lack of most of them.  

• Circle the letter A, B, C or D to indicate the underlined part that need correction in each of the following questions:

  Some people believe that human being will never use away all the natural resources on earth.