Một Hình Lập Phương Có Tổng Diện Tích Toàn Phần Bằng 216 M2. Thể ...

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Câu hỏi

Một hình lập phương có tổng diện tích toàn phần bằng 216 m2. Thể tích khối lập phương đó là:         

A.

 m3.

B.

  m3.

C.

72 m3.

D.

216 m3.

Đáp án và lời giải Đáp án:D Lời giải:

- Phương pháp:

Gọi a là cạnh của hình lập phương.Ta có công thức tính diện tích toàn phần của hình lập phương là: Công thức tính thể tích khối lập phương là:

- Cách giải: Ta có: Vậy thể tích khối lập phương đó là:   

Vậy đáp án đúng là: D.

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