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dangphuocsanh
2 năm trước
Cho hình chóp S.ABCD có đáy ABCD là hình vuông cạnh SA vuông góc với mặt phẳng đáy. CMR: AB vuông góc với (SAD) CD vuông góc với (SAD) CD vuông góc với SD SC vuông góc với BD Mọi người vẽ hình giùm mình với ạ, mình cám ơn 🙏
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