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hoangoanhj
2 năm trước
Cho hbh ABCD, E làb1 điểm bất kì trên AB. Qua E kẻ đường thẳng song song với AC cắt BC tại F và kẻ đường thẳng song song với BD cắt AD tại H. Đường thẳng kẻ qua F song song với BD cắt CD tại G. Chứng minh AH×CD=AD×CG
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