Cho tam giác vuông cân OAB có OA = OB = a. Độ dài của vectơ$2\overrightarrow{\mathrm{OA}} - \overrightarrow{\mathrm{OB}}$ bằng H(ãy chọn kết quả đúng):

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose a word that has different stress pattern:

  firework                  resource                 sponsor                  gradual

• Choose a word that has different stress pattern:

  suspicion                  imagine                  celebrate                   important

• Choose the best answer for the following sentence:

  I didn’t expect _____________ the job.
   

• Choose one sentence that has the same meaning as the root one:

  They made her train eight hours a day.

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

  stop                    post                    offer                    from

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

  school                  stood                     good                    look

• Choose a word that has different stress pattern:

  customer                   deliver                    kilometre                    document

• Choose the best answer for the following sentence:

  David, ______________ works in the central post office, is my best friend.

• Choose the best answer for the following sentence:

  ''____________ do you go to the post office, Nam?''

  ''Twice a week

• Choose the best answer for the following sentence:

  Our office is equipped ______________ advanced technology.