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	Các bình luận về: Đề bài: Cho hình lập phương $ABCD.A_{1}B_{1}C_{1}D_{1}$ có tâm $O$,gọi $I$ là tâm của mặt $CDD_{1}C_{1}$.Hãy phân tích các vectơ $\overrightarrow {AO},\overrightarrow {AI}$ theo ba vectơ $\overrightarrow {AB},\overrightarrow {AD},\overrightarrow {AA_{1}}$	</title>
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