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doanhieutrung23
2 năm trước
cho tam giác ABC vuông tại A. BD là tia phân giác góc ABC ( D thuộc AC). qua D vẽ đường thẳng vuông góc tại E câu hỏi: tia ED cắt tia BA tại F. C/m AE song song FC dạ tại em tóm tắt nên thiếu mn cứ hỏi ạ
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