duythanh1349 duythanh1349
  • 16-09-2022
  • Mathematics
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cho tam giác ABC cân tại A , trên tia đối của tia AB lấy M , Từ M kẻ đường thẳng // BC cắt AC tại N . CM :
a) tam giác AMN cân , từ đó suy ra AM = AN
b) NB = MC

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