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lamha20122016
1 năm trước
cho tam giác DEF cân tại D ,kẻ đường trung tuyến DM a) chứng minh tam giác DME = tam giác DMF b) gọi I là trung điểm DE.kẻ đường thẳng qua D và song song với EF cắt tia MI tại K chứng minh DK=MF c) chứng minh KE vuông góc EF
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