如图,
中,点
在
边上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/0c8bd5ac-9ff1-4be3-b453-d7bad2e6a38a.png?resizew=221)
(1)求证:
;
(2)点
在
边上,连接
交
于点
,且
,
,
①求
的度数;
②若
,
,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6beddaf874c75adb7e70ebdfd1bdaea4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/0c8bd5ac-9ff1-4be3-b453-d7bad2e6a38a.png?resizew=221)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d817b70f23eaba07fb6a100d9d5a17a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e6363330b33ca9feda927e6ffd3088.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/905f4cbe939c528692f367fe34333216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
更新时间:2021-08-12 21:17:16
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相似题推荐
解答题-问答题
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【推荐1】如图①,在
中,
,
,点D是
上一点,且
.动点F从点C出发沿
方向以每秒2个单位长度的速度向经点B运动,以
为边构造等腰直角三角形
,其中F为直角顶点,且点E与点B位于线段
两侧.设点F的运动时间为t(秒).
AI
(1)求线段
的长度;
(2)当点E落在
的中位线上时,求出t的值:
(3)连接
,则线段
的最小值是______.
(4)如图②.以点B为位似中心,将
缩小后得到
,且
.连接
,当
与
的某条边平行时,直接写出t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f6c6426f8f8826f3f15e20fda9e1cfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
AI
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/20/7ce24be4-5936-4218-ab77-daaba30a939a.png?resizew=315)
(1)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)当点E落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(4)如图②.以点B为位似中心,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf1c5eb81b252c151d4bb5be7fe3671.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b55e0eacb1626d36b6c04741869e3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5f840d4f0d3085c995ba83f11e6c588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5f840d4f0d3085c995ba83f11e6c588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f73fbc2f33d3402cd96a776a376d9835.png)
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解答题-证明题
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解题方法
【推荐2】如图,已知平行四边形OACB的顶点O、A、B的坐标分别是(0,0)、(0,a),(b,0),且a、b满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db070c82830d90d71ec5c8f36685a806.png)
(1)如图1,求点C的坐标;
(2)如图2,点P为边OB上一动点,作等腰Rt△APD,且∠APD=90°.当点P从O运动到点B的过程中,求点D运动路程的长度;
(3)如图3,在(2)的条件下,作等腰Rt△BED,且∠DBE=90°,再作等腰Rt△ECF,且∠ECF=90°,直线FE分别交AC、OB于点M、N,求证:FM=EN.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db070c82830d90d71ec5c8f36685a806.png)
(1)如图1,求点C的坐标;
(2)如图2,点P为边OB上一动点,作等腰Rt△APD,且∠APD=90°.当点P从O运动到点B的过程中,求点D运动路程的长度;
(3)如图3,在(2)的条件下,作等腰Rt△BED,且∠DBE=90°,再作等腰Rt△ECF,且∠ECF=90°,直线FE分别交AC、OB于点M、N,求证:FM=EN.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/5414d5c6-9f40-444a-aaf8-65539ea106f6.png?resizew=571)
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【推荐1】(1)特例感知:如图1,已知在Rt
ABC中,∠BAC=90°,AB=AC,取BC边上中点D,连接AD,点E为AB边上一点,连接DE,作DF⊥DE交AC于点F,求证:BE=AF;
(2)探索发现:如图2,已知在Rt
ABC中,∠BAC=90°,AB=AC=3,取BC边上中点D,连接AD,点E为BA延长线上一点,AE=1,连接DE,作DF⊥DE交AC延长线于点F,求AF的长;
(3)类比迁移:如图3,已知在
ABC中,∠BAC=120°,AB=AC=4,取BC边上中点D,连接AD,点E为射线BA上一点(不与点A、点B重合),连接DE,将射线DE绕点D顺时针旋转30°交射线CA于点F,当AE=4AF时,求AF的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(2)探索发现:如图2,已知在Rt
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(3)类比迁移:如图3,已知在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923363600850944/2926866963431424/STEM/82b5103e-ed1c-4985-b817-0e5f9080aeee.png?resizew=663)
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【推荐2】如图1,已知锐角△ABC的高AD、BE相交于点F,延长AD至G,使DG=FD,连接BG,CG.
![](https://img.xkw.com/dksih/QBM/2022/1/12/2892608644997120/2893534234353664/STEM/155a659c-1bc9-4958-853a-378cad141523.png?resizew=332)
(1)求证:
;
(2)如果
,设
.
①如图2,当∠ABG=90°时,用含m的代数式表示△BFG的面积;
②当AB=8,且四边形BGCE是梯形时,求m的值.
![](https://img.xkw.com/dksih/QBM/2022/1/12/2892608644997120/2893534234353664/STEM/155a659c-1bc9-4958-853a-378cad141523.png?resizew=332)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c16543c00b2dc8b065d472e51b645d7.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5742cf003ad2dacfdd66fab57de7bee.png)
①如图2,当∠ABG=90°时,用含m的代数式表示△BFG的面积;
②当AB=8,且四边形BGCE是梯形时,求m的值.
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【推荐1】如图,已知一次函数y=﹣x+7与正比例函数y=
x的图象交于点A,且与x轴交于点B.
(1)求△AOB的面积:
(2)在y轴上找一点C,使AC+BC最小,求最小值及C点坐标.
(3)点P从O出发向B点以1个单位每秒的速度运动,点Q从B点出发向A点以同样的速度运动,两个点同时停止,当△BPQ为等腰三角形时,求Q点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
(1)求△AOB的面积:
(2)在y轴上找一点C,使AC+BC最小,求最小值及C点坐标.
(3)点P从O出发向B点以1个单位每秒的速度运动,点Q从B点出发向A点以同样的速度运动,两个点同时停止,当△BPQ为等腰三角形时,求Q点坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/9a2a797d-288d-4cc7-934b-25e624782e23.png?resizew=389)
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【推荐2】如图1所示,腰长为3的等腰
的腰与坐标轴重合,直线
与
交于点
.
(1)求点
的坐标;
(2)如图2,将直线
沿
轴正方向平移4个单位长度得到直线
(其中
、
分别为新直线与
轴、
轴的交点),连接
、
,求
的面积;
(3)如图3,在第(2)问的条件下,将
沿
轴平移得到
,连接
、
,当
为等腰三角形时,直接写出
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf33aa3d1fbed7a3ba2983f1ed27451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a71456427cf82a02e26476a1eea5d76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)如图2,将直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4b17ce6e90cd3810a3696262e94c1e.png)
(3)如图3,在第(2)问的条件下,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd2981bf2261343f905ec1b5355a3c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4f1a4660cd7233882250578f1ecc113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c043c1a8696b06caf7d4bcd0d81e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/2021/2/1/2648777526247424/2680359628816384/STEM/2df7bb22-91ea-4772-8259-78e15f39a871.png)
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