Trong mặt phẳng cho nhiều đường thẳng song song cách đều nhau. Chứng minh rằng không thể dựng được một ngũ giác đều có đỉnh nằm trên các đường này.
Bài này ngại vẽ hình quá :) –  Trần Nhật Tân 03-09-13 09:14 PM

bị xóa vì bị trùng bởi Đức Vỹ 27-10-13 03:32 PM

Câu hỏi này có nội dung hoàn toàn trùng với câu hỏi đã có.

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