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thanhhuyen240803
2 năm trước
1) Cho ΔABC. Gọi H là trung điểm của cạnh AB. Trên tia đối của tia HC lấy điểm M sao cho HM=HC a) C/m AM=BC b) Vẽ đường trung tuyến BK (K∈AC), đường thẳng AM cắt đường thẳng BK tại N. C/m A là trung điểm của MN. ~ Giúp mình với ~
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