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Cho tam giác ABC vuông cân tại A. Trên cạnh AB và AC lần lượt lấy 2 điểm D và E sao cho AD= AE. Trên tia đối của AB lấy F sao cho AF= AD. a/ Chứng minh: Tam giác BAE= tam giác CAF b/ Từ D và A hạ các đường thẳng vuông góc với BE, chúng cắt BC tại I và K. Chứng minh: KI= KC Giúp mình ạ
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