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quynhtyp2k1
2 năm trước
cho tam giác MNP cân tại M có đường cao MI .Trên tia đối của tia NI lấy điểm A sao cho NA = NI. lấy điểm B sao cho P là trung điểm của MB a. chứng minh rằng : I là trung điểm của NP và I cách đều hai cạnh MN,MP. b.Chứng minh rằng BI=MA c.Gọi C là trung điểm của AB.Chứng minh rằng ba điểm M,I,C thẳng hàng
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