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tnvthuyen20172018
2 năm trước
cho tam giác ABC vuông tại A có AD là đường trung tuyến. tia Cx nằm giữa 2 tia CA và CB . tia phân giác của góc BCx cắt AB tại O. vẽ ( O ) tiep xúc với BC tại M. gọi E là giao điểm của AD và Cx a, tứ giác CAOM nội tiếp đường tròn b, tia Cx tiếp xúc với (O) tại 1 điểm ( gọi là điểm N) c, tia AO là tia phân giác của góc MAN d, EA=EN
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