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thanhluoi
2 năm trước
Cho hbh ABCD.Từ A vẽ đường thẳng cắt đường chéo BD ở I,cắt CB ở J,cắt phần kéo dài cạnh DC ở K.Cm: a,BI.IA=DI.IJ ; DI.AB=DK.BI c,AB/AJ=KC/KJ
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