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Taytuan28022000
2 năm trước
Bài 1: Cho tam giác ABC cân tại A, điểm I thuộc đường cao AH. a)Chứng minh rằng IB = IC ( Giải bằng nhiều cách) b)Kể tên các hình đối xứng qua AH của điểm B, điểm A, đoạn thẳng AB, đoạn thẳng HB. (ko câần vẽ hình)
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