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thunam8778
2 năm trước
Cho hình chóp SABC có đáy ABC là tam giác đều cạnh a , SC =(a căn 6 )/2 và tam giác SAB đều . Gọi M , N lll trung điểm AB , BC . Khi đó khoảng cách giứa AB và SC bằng bao nhiêu vậy ạ .
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