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honghanh1210
2 năm trước
Cho △ ABC có góc A=90 . Lấy điểm H trên cạnh AC.E là hính chiếu của H lên BC a)Chứng minh:ΔABC đồng dạng ΔEHC b)chứng minh:góc HBC=EAC c)Gọi I là giao điểm của đoạn AE và BH C/m:AB.HI=AI.HE Giúp vs đang cần cực gấp nhất là câu c
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