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Cho tam giác ABC vuông tại A, góc C=20 độ, CD là tia phân giác, E thuộc AC, góc ABE=30 độ, tia phân giác của góc CBE cắt AC tại I. Chứng minh: DE // BI. [Giúp em với em đang cần gấp ạ]
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