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nguyentrathuuyen2016
2 năm trước
Bài 3: Cho tam giác MNP cân tại M. PE  MN (E  MN), NF  MP (F  MP). a) Chứng minh: MNFMPE b) Gọi I là giao điểm của NF và PE. Chứng minh tam giác IEF cân. c) Chứng minh EF//NP.
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