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phanlonghd2810
2 năm trước
Cho tam giác ABC vuông cân tại C. Lấy E thuộc BC. Qua B kẻ tia vuông góc với AE tại H cắt AC tại K. Chứng minh a) 4 điểm B ,H ,C,A cách đều trung điểm O của AB b) KC.KA=KH.KB
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