↖↗ >:(

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↙↘  ↚ ↚ ↚ ↚v ↚ ↚ ↚ ↚ ↚ ↚ ↚↚ ↚ ↚ ↚v ↚ ↚ ↚ ↚ ↚ ↚ ↚↚ ↚ ↚ ↚v ↚ ↚ ↚ ↚ ↚ ↚ ↚↚ ↚ ↚ ↚v ↚ ↚ ↚ ↚ ↚...

Cho một khối tứ diện có thể tích V. Gọi V ' là thể tích khối đa diện có các đỉnh là trung điểm các cạnh của khối tứ diện đã cho. Tính tỉ số $\frac{V}{V\text{'}}$