Cho hình bình hành ABCD . Gọi E là điểm bất kì trên cạnh AB . Qua E kẻ đường thẳng // AC cắt BC tại F và kẻ thẳng // BD cắt AD ở H. Đường thẳng kẻ qua F song song với BD cắt CD ở G . C/m AH.CD=AD.CG bạn nào làm bài này hộ mình sẽ vote 5* và +1 cảm ơn

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