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cuongmaimaiyeuem12
2 năm trước
Cho ∆ ABC cân tại Ạ. Trên cạnh BC lấy điểm M, N sao cho : BM=CN (M nằm giữa B và N) a) chứng minh AM=AN suy ra ∆AMN cân tại A b) Từ 2 điểm M, N kẻ các đường thẳng vuông góc với BC cắt AB và AC lần lượt tại D, E Chứng minh ∆BMD=∆CNE c) Cho góc BDSM =30° . Tính số đo góc BAC
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