Cho hình hộp ABCD.A’B’C’D’ có đáy là hình chữ nhật., AB=a, AD=AA’=2a. Hình chiếu vuông góc của A’trên mặt phẳng (ABCD) trùng vói trung điểm cạnh BC. Tính khoảng cách giữa hai đường thẳng AB’ và BD’.
Chẳng nhẽ không có ai làm dược bài này sao! –  dulethuy 08-04-16 09:48 PM

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