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∆ABC có D trên AB và BD=1/3AB. Kẻ DE song song với BC (E∈AC). O là giao điểm của BE và CD. Tìm OE/OB

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∆ABC có D trên AB và BD=1/3AB. Kẻ DE song song với BC (E∈AC). O là giao điểm của BE và CD. Tìm OE/OB

∆ABC có D trên AB và BD=1/3AB. Kẻ DE song song với BC (E∈AC). O là giao điểm của BE và CD. Tìm OE/OB

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