cho hình chóp S.ABC SA=3a, SA tạo với đáy 1 góc 60. Tam giác ABC vuông tại B, góc ACB=30. G là trọng tâm tam giác ABC. 2 mặt phẳng (SGB), (SGC) cùng vuông góc với mặt phẳng ABC. Tính thể tích khối SABC


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