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betbolao06
2 năm trước
Cho ∆ABC cân tại A. Kẻ AH vuông góc với BC (H thuộc BC) a/ chứng minh: ∆AHB =∆AHC b/ trên tia đối của tia HA lấy điểm M sao cho HM =HA. Chứng minh: ∆ABM cân c/ Chứng minh: BM // AC
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