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duyanhmntaymo
2 năm trước
Bài 4: Cho ΔABC cân tại A. Gọi I là trung điểm cạnh BC, kẻ tại D, kẻ tại E. Chứng minh a) ΔABI = ΔACI. b) ΔEDI cân. c) DE // BC. d) AB^2 = AD^2 + BD^2 + 2DI^2.
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