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anh.min.conghoa
2 năm trước
Cho tam giác ABC vuông tại A có AB = 6cm , AC = 8cm .Từ B kẻ đường thẳng a // AC ; phân giác góc BAC cắt BC tại M và cắt đường thẳng a tại N . a) CM : ΔBMN đồng dạng ΔCMA b) CM : AB/AC = MN/AM c) Từ N kẻ NE vuông góc với AC ( E ∈ AC), NE cắt BC tại I .Tính BI.
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