Cho ∆ABC vuông tại A có AB = 3cm, AC = 4cm. Lấy điểm M trên cạnh AB sao cho AM = 1cm. Kẻ đường thẳng qua M và vuông góc với AB cắt BC tại N. a) Tính độ dài BC ? b) Tính BN và CN ?

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