Question

       Chứng minh rằng nếu khối đa tiện có mỗi đỉnh là đỉnh chung của các cạnh thì số đỉnh phải là số chẵn. ( Có ai lớp 12 thì lm giúp nha, được tick thanks )

Answer 1

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Answer 2

Thui khỏi bt lm òi * nhắn lun ko bt cho nhanh lại cn lm màu *