如图,已知
,
,
,
,则DF=___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a120b008b7be40c9d6f6079bca61652.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a19338598965bb3856cdd0236bbf694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/0239f43d-16f6-42f6-bb92-1a8fc0f709a8.png?resizew=153)
更新时间:2022-11-03 20:13:46
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【知识点】 由平行判断成比例的线段解读
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【推荐1】两条直线被一组平行线所截,所得的对应线段成比例.如:
____ ,
____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af16f828b762b5c079c98eef6bc3bcda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b05491affc0fadeb4b92537f3dcb6ac.png)
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898732065390592/2899395944357888/STEM/8896661b-c082-4abd-854c-c1ed55b586e6.png?resizew=200)
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【推荐2】如图,点A、B、C和点D、E、F分别位于同一条直线上,如果
,且
,
,那么![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b484c6569f3a96d76b77816ea38af552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13a41b3e3607b212ac6b7c6051c250a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/2523274f-ad0d-4247-837e-6a97a8c96530.png?resizew=145)
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