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vhthuconan1
2 năm trước
Cho hình chóp S.ABCD có đáy ABCD là hình bình hành tâm H. Mặt phẳng (P) đi qua H và song song với mặt phẳng (SAB). Tìm giao tuyến: 1. (P) và (ABCD) 2. (P) và (SBC)
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