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vankieun1
2 năm trước
Cho tam giác ABC ( góc A = 90 độ ); BD là tia phân giác của góc B ( D thuộc AC ). trên tia BC lấy điểm E sao cho BA = BE a) Chứng minh: DE vuông BE b) Chứng minh: BD là đường trung trực của AE c) Kẻ AH vuông BC. So sánh EH và (giúp mình câu c )
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