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uuxinhxinh2701
2 năm trước
cho tam giác ABC, cân tại A. Trên các cạnh bên AB, AC lấy các điểm M và n sao cho bm=cn a) tứ giác bmnc là hình gì? vì sao? b) biết a=40 độ. tính các góc củ tứ giác bmnc?
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