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huongminhvo
2 năm trước
Cho tam gíac ABC có AB=AC.Kẻ AM vuông góc với BC , M thuộc BC.Chứng minh a.tam gíac AMB=tam giác AMC b.AM là tia phân giác ^A Đường thẳng đi qua B vuông góc với BC cắt BC tại I .Chứng minh CI vuông góc với CA
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