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Mathematics, 29.07.2021 14:40 melkumathurin
Cho chóp S. ABCD, đáy là hình bình hành tâm O. Gọi M, N,P lần lượt là trung điểm của OB, SD, BC a) Tìm giao tuyến của (NPO) và ( SCD) ; (SAB) và (AMN) b) Tìm giao điểm E của SA với (MNP). C/m : ME // PN. tìm giao điểm mn và (scd) e) Tìm thiết diện khi bị cắt bởi (MNP)
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Cho chóp S. ABCD, đáy là hình bình hành tâm O. Gọi M, N,P lần lượt là trung điểm của OB, SD, BC a) T...
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