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nguyentienduc3003
2 năm trước
Tam giác DEF vuông tại D, vẽ trung tuyến DI, trên tia đối của ID lấy H: DI=IH a. Chứng minh: EH//DF b. DEH là tam giác vuông c. Chứng minh: tam giác DEH=tam giác EDF
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