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thu2018
2 năm trước
Cho hình chóp tứ giác đều S.ABCD có đáy ABCD là hình vuông cạnh a tâm O,SO vuông với mp đáy (ABCD),cạnh bên bằng a căn 3 /2 .tính góc giữa mặt bên và mặt đáy
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