Cho hai đường tròn (O ; R) và (O' ; R') tiếp xúc ngoài tại A. Kẻ một đường thẳng bất kì qua A và cắt (O); (O') tại B, C. Tỉ số k của phép vị tự tâm A biến B thành C là

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose a word that has different stress pattern:

  November                  diploma                    interrupt                     romantic

• Choose a word that has different stress pattern:

  mathematics                 university                  difficult                      calculate

• Choose the best answer for the following sentence:

  Nowadays, more and more young people want to have a university _________ .
  
  

• Choose the best answer for the following sentence:

  He took _____________ the position that his father had obtained at the college.

• Choose the best answer for the following sentence:

  Tran Hieu Ngan was the first Vietnamese athlete ____________ an Olympic medal.
  
  

• Choose the best answer for the following sentence:

  After it ____________ dry for two months, it rained heavily last night.
  
  

• Choose the best answer for the following sentence:

  When I ______________ to visit him, he ________________ to work.
  
  

• Choose one sentence that has the different meaning to the root one:

  Her living conditions were difficult. However, she studied very well.
  
  

• Choose one sentence that has the different meaning to the root one:

  She likes sports. She likes reading.
  
  

• Choose one sentence that has the different meaning to the root one:

  She met Pierre in 1894 and in the following year they were married.