如图,已知点D为
斜边
上的中点,
交
于点F,
,若
,
,则
的长为 ____________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/032b3e422eeb39cf649dffc9934a7cf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0587fdaa78182669015caae54e50cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffc2817fa590affb5a760a25dc65308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
更新时间:2024-05-22 22:43:23
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【推荐1】已知
是一元二次方程
的两个数根,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec7c9b0b0e6f2c1fdcda2f9bf27cad86.png)
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
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真题
名校
【推荐1】如图抛物线y=x2+2x﹣3与x轴交于A,B两点,与y轴交于点C,点P是抛物线对称轴上任意一点,若点D、E、F分别是BC、BP、PC的中点,连接DE,DF,则DE+DF的最小值为_____ .
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/d560380a-9250-48d3-a717-16b828e9ea12.png?resizew=158)
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【推荐2】如图,在菱形
中,对角线
与
相交于点
,边
的长为8,点
分别是边
上的动点,则
周长的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b62b997ff70441a93e187bb04b51be5.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/24/60aedb6a-ff51-4f41-8605-ecde07e95a06.png?resizew=198)
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解题方法
【推荐1】如图,在▱ABCD中,对角线AC⊥BC,∠BAC=30°,BC=2
,在AB边的下方作射线AG,使得∠BAG=30°,E为线段DC上一个动点,在射线AG上取一点P,连接BP,使得∠EBP=60°,连接EP交AC于点F,在点E的运动过程中,当∠BPE=60°时,则AF=_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/29/f11657e1-4f1e-4c49-a697-f8dade399c1a.png?resizew=200)
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【推荐2】如图,在
中,
,点
是
的中点,连结
,过点
作
,分别交
于点
,与过点
且垂直于
的直线相交于点
,连结
,给出以下几个结论:①
;②
;③点
是
的中点;④
.其中正确的结论是_______________________ (写出所有正确结论的序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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