Cho tam giác ABC có góc A=90 độ. Từ điểm K trên cạnh BC (K khác B, K khác C) kẻ KH vuông góc với AC. Trên tia đối của tia HK lấy điểm I sao cho HI=HK. Chứng minh a) AI=AK b) góc BAK= góc AIK Mọi người giúp mình đi với Ạ. Trong tối nay nha, mai có cần rất gấp. Biết ơn lắm ạ

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