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diepvinhdg
2 năm trước
cho tam giác ABC vuông tại A,có AB=8cm và AC =6cm a.tia phân giác góc B cắt AC tại D,vẽ DE vuông góc với BC tại E CM:tam giác ABD=tam giác EBD b.Đường thẳng DE cắt đường thẳng AB tại F.CM:tam giác BFC cân c, so sánh DA và DC
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