[HH12. C1. 3. D02. b] Cho khối tứ diện $OABC$ có ba cạnh $OA,OB,OC$ đôi một vuông góc với nhau và $OA=2OB=3OC=3a$ . Thể tích của khối tứ diện đã cho bằng

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Một số câu hỏi khác có thể bạn quan tâm.

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

  touch                      choose                       research                       school

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

  They were several reasons why he couldn't perform in the concert.

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

  If he didn't speak so quick, we could understand him.

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

  improve                        lose                        consider                      choose

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

  spirit                       despite                     animal                  disturb

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

  Your typewriter has been fixed and you can pick him up any time.

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

  In spite interruption, she was still able to finish her assignment before class.

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

  type                     geography                  economy                    ecosystem

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

  If I don't like you, I wouldn't invite you to my house.

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

  There has been six cases of the disease so far in this hospital.