如图,AD是△ABC的中线,点E是AD的中点,点F是BE延长线与AC的交点,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca07b4b1d1d30ebf0a5a402ad8aeecf.png)
![](https://img.xkw.com/dksih/QBM/2015/11/4/1573923444211712/1573923450568704/STEM/20c4e92cb9d24116b306ef904bb0a36e.png)
更新时间:2016-12-06 02:58:22
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【知识点】 与三角形中位线有关的求解问题解读
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,在边长为4的等边
中,
,
分别为
,
的中点,
于点
,
为
的中点,连接
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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解答题-证明题
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适中
(0.65)
名校
【推荐2】已知:如图,
及
外一点
.请你按照步骤完成以下作图(尺规作图,保留作图痕迹)
连接
,以
为圆心,
长为半径作大圆
;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
交小圆
于点
,过点
作小圆
的切线交大圆于
,
两点(点
在点
的上方);
连接
交小圆
于
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/17/a7725376-6b30-49d4-8d55-a0adde418144.png?resizew=128)
(1)请证明
是小圆
的切线;
(2)延长
交大圆
于
,连接
,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/17/a7725376-6b30-49d4-8d55-a0adde418144.png?resizew=128)
(1)请证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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