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Mathematics, 27.08.2021 20:30 10121545

1. Cho khối tứ diện ABCD có thể tích V. Gọi V ′ là thể tích của khối tám mặt có các đỉnh là trung điểm các cạnh của khối tứ diện ABCD. Tỉ số
V
V
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