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24yennhi
2 năm trước
b. Chứng Bài 6 : Cho hình chóp S.ABCD có đáy ABCD là hình thoi tâm O với SA = SC, SB = SD. Chứng minh a.SO vuông góc với (ABCD) b.AC vuông góc SD, BD vuông góc SA ai giup e vs ạ e cảm ơn
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