Mathematics, 24.10.2021 14:00 noaheault
Cho hình chóp S. ABCD có đáy ABCD là hình thang vuông tại 2 đỉnh A, D. Tam giác SAB vuông cân tại A. Biết AB=3a, AD=a, CD=2a. Điểm M di động trên AD, mặt phẳng (P) đi qua M song song SA, CD. Mặt phẳng B cắt SD, SC, BC tại F, E, N. Gọi I là giao điểm của ME và FN, J là trung điểm BC, Q là giao điềm của IJ với mặt phẳng (SAB). Chứng minh SQ đi qua trung điểm AB và
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Cho hình chóp S. ABCD có đáy ABCD là hình thang vuông tại 2 đỉnh A, D. Tam giác SAB vuông cân tại A....
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