如图(1)
中,
,D是
的中点,延长
至点E,使
,延长
交
于点F,探究
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/22/b047ebd2-4612-4b09-a867-4705b7371fa0.png?resizew=438)
(1)先将问题特殊化.如图(2),当
时,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b01700e039d8ef9005f21ce1b9ac8fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
__________ ;
(2)如图(3)
中,
,D是
的中点,G是边
上一点,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d214ae540f87308e6cd79ba767417f9.png)
(
),延长
至点E,使
,延长
交
于点F.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b01700e039d8ef9005f21ce1b9ac8fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
________ (用含n的式子表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f41d05b6019f05dc520c56f9942145a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8946331b0a9d86e1a9c78797f3021455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b01700e039d8ef9005f21ce1b9ac8fc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/22/b047ebd2-4612-4b09-a867-4705b7371fa0.png?resizew=438)
(1)先将问题特殊化.如图(2),当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/944ea0ea81ff5678716320ace38c1091.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b01700e039d8ef9005f21ce1b9ac8fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
(2)如图(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d214ae540f87308e6cd79ba767417f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee6a2eba56d4f2d1670b0256b8d86b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f63c89b06b9e0090f07914d57a4b847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c6bbde2a6aa141f91db418a950b7d53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8946331b0a9d86e1a9c78797f3021455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b01700e039d8ef9005f21ce1b9ac8fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
更新时间:2023-11-18 15:06:12
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