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phuocpersie
2 năm trước
cho tam giác abc vuông tại a (ab<ac) . Trên cạnh ac lấy điểm d sao cho ad=ab, tia phân giác của góc bac cắt bc tại i a) chứng minh id=ib b)gọi e là giao điểm của di và ab, chứng minh ac=ae vẽ hình
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