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nguyenanhtuancr7
2 năm trước
Cho hình chóp S.ABCD có đáy là hình vuông cạnh bằng a, tâm o và có SA vuông góc (ABCD). Biết SA=a√3. A, cm CD vuông góc (SAD) B,cm BD vuông góc SC C, tính góc chính giữa SD và mặt phẳng SAB D,Tính góc giữa SO và SM với M là trung điên AD
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