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hien18052001tlhy
2 năm trước
cho em hỏi bài này ạ: Cho hình chóp S.ABCD có đáy là hình thang, đáy lớn là AD và AD=2BC.Gọi O là giao điểm AC và BD, G là trọng tâm tam giác SCD. a) CMR: OG song song (SBC). b) Gọi M là trung điểm SD.CMR: CM song song (SAB). c) Giả sử I nằm trong đoạn SC sao cho SC=3/2 SI. CMR: SA song song (BID)
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