已知,在直角三角形
中,
,
是
上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/db59e1ca-5609-49e9-89e1-0da180f8b513.png?resizew=315)
(1)如图
,求证:
;
(2)将
沿
所在直线翻折,A点落在
边所在直线上,记为
点.
如图
,若
,求
的度数;
若
,请直接写出
的度数
用含
的代数式表示
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd6fe78f6cfdfefd6d8be45473b25b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/db59e1ca-5609-49e9-89e1-0da180f8b513.png?resizew=315)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc8396a7120abeaae6236a9292e5b9f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b6142a74e0c6925014abd038c340f6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0846695e67a3809ecde556c5d1ef2e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2c9622dbfc6bd5b5820ed7a952d92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0846695e67a3809ecde556c5d1ef2e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
更新时间:2024-01-09 13:40:37
|
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解答题-证明题
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适中
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【推荐1】已知:在△ABC中,BD⊥AC垂足为点D,CE⊥AB垂足为点E,BD与CE相交于点H.
(1)求证:∠1=∠2;
(2)若∠A=40°,求∠BHE的度数.
(1)求证:∠1=∠2;
(2)若∠A=40°,求∠BHE的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/f01f7726-bdbb-4969-855d-8831b1df4d5c.png?resizew=124)
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解答题-问答题
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适中
(0.65)
【推荐2】在锐角三角形
中,
,
是高,延长
至点
,再连接
并延长,与
的延长线交于点
,已知
,请你探究:
(1)当
时.
①求
的大小(用含
的式子表示);
②求证:
;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/509c13b189ec657d5aa56d9347cd4de0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/19/35095613-08f1-43fb-a5a5-2ef2549dc8a2.png?resizew=112)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/224efa375375f1ac848b0c15ee51aebd.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f9c3b578fc0598d5ec6c79404c6cc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b59d1481a14919877fe8a13507ec2428.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/774f480884e0e7e5bfcdda5131f2b535.png)
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解答题-证明题
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适中
(0.65)
【推荐1】学习完《勾股定理》一章,李凯和张亮剪了一张直角三角形和一张长方形纸片,进行如下操作:
中,
,
,
,如图①,将直角边
沿直线
折叠,使它落在斜边
上,点C与点E重合,请求出
的长;
操作二:如图②,在长方形
中,
,
,在
边上取一点P,将
沿直线
折叠,点C恰好与
边上的点E重合,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
操作二:如图②,在长方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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解答题-证明题
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(0.65)
名校
解题方法
【推荐2】在△ABC中,
,点D是BC上一点,将△ABD沿AD翻折后得到△AED,边AE交射线BC于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/cae2b30e-9ac6-41c8-a1ef-703fe354b3ef.png?resizew=566)
(1)如图①,当AE⊥BC时,求证:DE
AC;
(2)若
,
.
①如图②,当DE⊥BC时,求x的值;
②是否存在这样的x的值,使得△DEF是等腰三角形?若存在,求x的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/cae2b30e-9ac6-41c8-a1ef-703fe354b3ef.png?resizew=566)
(1)如图①,当AE⊥BC时,求证:DE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30af6898fe67ace4a68bb01aed320524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f13be03c1a7cbd8b9c8ebbfd914b1d81.png)
①如图②,当DE⊥BC时,求x的值;
②是否存在这样的x的值,使得△DEF是等腰三角形?若存在,求x的值;若不存在,请说明理由.
您最近一年使用:0次