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lethien82hg
2 năm trước
Bài 2. Cho hình chóp S.ABCD có đáy ABCD là hình thoi tâm I, có cạnh bằng a và đường chéo BD = a. SC = $\frac{a\sqrt[]{6} }{2}$ và vuông góc với (ABCD). Chứng minh (SAB)⊥ (SAD)
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