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vanminh2019
2 năm trước
Cho tứ giác ABCD nội tiếp đường tròn tâm O ,đường kính AD .gọi E là giao điểm của 2 đường chéo AC và BD .H là hình chiếu vuông góc của E trên AD .lấy K đối xứng với C qua AD .chứng minh B,H,K thẳng hàng Mong m.n giúp ❤❤❤❤
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