Cho khối hộp ABCD.A’B’C’D’. Tính tỉ số thể t...

B

- Hướng dẫn giải

Đáp án B.

Ta có $V_{ACB\text{'}D\text{'}}=V_{ABCD.A\text{'}B\text{'}C\text{'}D\text{'}}-V_{D\text{'}.ACD}-V_{C.A\text{'}B\text{'}D\text{'}}-V_{B\text{'}.ABC}$

$=V_{ABCD.A\text{'}B\text{'}C\text{'}D\text{'}}-4.\frac{1}{6}{V}_{ABCD.A\text{'}B\text{'}C\text{'}D\text{'}}=\frac{1}{3}{V}_{V_{ABCD.A\text{'}B\text{'}C\text{'}D\text{'}}}.$