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2 năm trước
Cho hình chóp S.ABCD có đáy là hình bình hành. Gọi G là trọng tâm Tam giác SAD, I là trung điểm AD. Trên CD lấy M sao cho MC=2MD. Gọi N là giao điểm của IC và BD a. C/m ()MNG) // ( SBC) b. Gọi J là giao điểm IM và BC. Chứng minh MG//SJ
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