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haonhientruong58
2 năm trước
Cho hình chóp SABCD , đáy là hình thang vuông tại A,D ; SA = 2a , AB = 2a , AD =a và SA vuông góc với (ABCD) Tính góc MAC và ABCD với I , M lần lượt là trung điểm của AB , SI
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