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cho tam giác ABC vuông ở C có góc A bằng 60 độ . tia phân giác của góc BAC cắt BC ở E .kẻ EK ⊥ AB (k ∈ AB). kẻ BD vuông góc với tia AE (D thuộc tia AE). Chứng minh a, AC =AK b, AE ⊥CK c, KA =KB
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