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2 năm trước
Cho hình Chóp SABCD có đáy ABCD là hình thang (AB là đáy lớn ) . Gọi M,N,P lần lượt là trung điểm của các cạnh CD,BC,SA a, tìm giao tuyến 2 mặt phẳng (MNP) và (SAB) b, tìm giao tuyến của SB và (MNP)
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