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linhlk22cht
2 năm trước
Cho ΔABC cân tại A, góc C = 30 độ .vẽ tia pg AD (D ∈BC).Vẽ DE ⊥AB, DF ⊥AC a,Cm ΔDEF đều b, ΔBED= ΔCED c,Kẻ BM song song AD (m ∈ AC) .Cm ΔABM đều
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