Trong không gian với hệ tọa độ Oxyz, cho hai mặt phẳng và . Tìm a để (P) và (Q) vuông góc với nhau.

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the correct sentence which is built from the words and phrases given.

  New / house / near / sport centre / so / we / swim / play / tennis //.
  
  

• Choose the correct sentence which is built from the words and phrases given.

  She / go / wave / until / train / out / sight //.
  
  

• Choose the word that has the underlined part pronounced differently from the rest:  

  shifts                 retails                       drugs                    sectors

• Choose the word that has the underlined part pronounced differently from the rest:  

  sacrificed            approached                   reformed                   clapped

• Choose the word that has the underlined part pronounced differently from the rest:  

  flame                  stagnant                      labour                     change

• Choose the word that has the underlined part pronounced differently from the rest:  

  ethnic                  thank                 author                though

• Choose the word that has the underlined part pronounced differently from the rest:  

  daydream               breathe                 threat                  reason

• Choose a word that has different stress pattern:

  eternal               domestic                maximum                 contractual

• Choose a word that has different stress pattern:

  household                 maintain                    workforce                 follow

• Choose a word that has different stress pattern:

  eradicate                  inhabitant                  curriculum                 optimistic