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daegus2busan
2 năm trước
Giúp em, e càn gấp quá ạ Cho hình chóp S.ABC có đáy ABC là tam giác đều cạnh a. Gọi M là trung điểm của BC. Hình chiếu vuông góc của S trên đáy trùng với trung điểm H của AM. Tính thể tích khối chóp S.ABC theo a
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