Chứng minh rằng, số góc của tất cả các mặt gấp đôi số cạnh của khối đa tiện. Suy ra góc chẵn. ( ĐƯỢC TICK )
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CM
15 tháng 1 2018
Đáp án A
Nếu số mặt là 6 dễ thấy số cạnh là 9, nếu số mặt là 4 thì số cạnh là 6 do đó (2) sai.
CM
8 tháng 2 2019
Đáp án A
Nếu số mặt là 6 dễ thấy số cạnh là 9, nếu số mặt là 4 thì số cạnh là 6 do đó (2) sai.
