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itotemu
2 năm trước
:Cho hình chóp S.ABCD. M, N, P là các điểm lần lượt ở trên các cạnh SA, SB, CD sao cho MN không song song với AB. Tìm các giao tuyến của (MNP) với: a) (ABCD) . b) Các mặt bên của hình chóp S.ABCD.
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