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quocthai
2 năm trước
Cho hình chóp S.ABC có SA vuông góc với đáy, tam giác ABC vuông tại B. Biết SA = AB = BC Tính góc giữa đường thẳng SB và mặt phẳng ( SAC) A. 30 độ B. 45 độ C. 60 độ D. arccos 1/3
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