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thptphuongson01
2 năm trước
Cho tm giác ABC có AB=3cm,AC= 4,5cm. lấy điểm M trên cạnh AB sao cho BM=1cm, lấy điểm N trên cạnh AC sao cho CN=1,5cm. a,CMR: MN//BC b,Gọi K là trung điểm của BC,tia AK cắt MN tại I: CM: NI/CK=AI/AK CM:I là trung điểm của MN. c, gọi O là giao của MC và IK. CMR:B,O,N thẳng hàng giúp mk vs ạ
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