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locthuvien
2 năm trước
Bài 15. Cho ABC vuông cân tại B có H là trung điểm của AB. Lấy điểm E trên BC, lấy điểm D trên tia đối của tia BC sao cho BD =BH =BE . a) So sánh HD và HC . b) Chứng minh tgBHD= tgBHE . c) Chứng minh H là trực tâm của ACD
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