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nnhatanh439
2 năm trước
cho hình chóp SABC có đáy ABC là tam giác đều cạnh a, góc giữa đường SA và mặt phẳng (ABC) bằng 45 độ. Hình chiếu vuông góc của S lên (ABC) là điểm H thuộc BC sao cho BC=3BH. Thể tích của khối chóp SABC bằng?
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