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DINHTCTV
2 năm trước
cho hình chóp sabcd có đáy abcd là hình bình hành .Gọi G1,G2 lần lượt là trong tâm của tam giac SAB.SAD,M thuộc SC :MS=2MC a) G1G2//(abcd) B) (mg1g2)//(abcd)
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