Cho ba hình cầu có bán kính lần lượt là $R_1,R_2,R_3$ đôi một tiếp xúc nhau và cùng tiếp xúc với mặt phẳng (P). Các tiếp điểm của ba hình cầu với mặt phẳng (P) lập thành một tam giác có độ dài cạnh lần lượt là 2,3,4. Tính tổng $R_1+R_2+R_3$

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Một số câu hỏi khác có thể bạn quan tâm.

• Find a mistake in the four underlined parts of the sentence and correct it:

  While those efforts have helped Vietnam expand production of oil and natural gas, domestic

  consumption of these resources has also increased as a result of rapid economic grow.

• Find a mistake in the four underlined parts of the sentence and correct it:

  At present, it is estimated that coal accounts for 12 percent of Vietnam’s electricity

  generation; although, some expect that this figure will rise to 25 percent in the future.

• Find a mistake in the four underlined parts of the sentence and correct it:

  The Asian Games, which also called the ASIAD, is a multi-sport event held every four years

  among athletes from all over Asia.

• Find a mistake in the four underlined parts of the sentence and correct it:

  The Asian Games is regulated by the Olympic Council of Asia under the supervise of the

  International Olympic Committee.

• Find a mistake in the four underlined parts of the sentence and correct it:

  Competitors which are entered by the National Olympic Committee to represent 

  their country.

• Find a mistake in the four underlined parts of the sentence and correct it:

  National anthems and flags accompanying the medal ceremonies, and tables showing the

  number of medals that won by each country are widely used.

• Find a mistake in the four underlined parts of the sentence and correct it:

  Guangzhou is also the second city in China hosting the Asian Games after Beijing in 1990.

• Find a mistake in the four underlined parts of the sentence and correct it:

  The 17^th Asian Games, officially known as the XVII ASIAD, is the largest sporting event in

  Asia governing by Olympic Council of Asia.

• Find a mistake in the four underlined parts of the sentence and correct it:

  When I was a student I described myself as book-worm because of I really love reading

  anything that caught my interest.

• Find a mistake in the four underlined parts of the sentence and correct it:

  I paint almost every day although sometimes I do not have so many time.