Cho tam giác ABC vuông tại A. Vẽ phân giác BD trên BC lấy điểm E sao cho BE=AB. Kẻ AH vuông góc BC a/CM: AD=DE b/CM: AH song song DE c/Trên tia đối của tia ED lấy điểm K sao cho EK=ED. CM: góc EKC = góc ABC

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