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	Các bình luận về: Đề: Trong không gian Oxyz, cho bốn điểm \(A\left( {1,0,0} \right);\,B\left( {0,1,0} \right);C\left( {0,0,1} \right);D\left( {1,1,1} \right)\). Xác định tọa độ trọng tâm G của tứ diện ABCD.	</title>
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