如图1,平面内有一点
到
的三个顶点的距离分别为
、
、
,若有
,则称点
为
关于点
的勾股点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/3b38d46d-5afa-44ee-a7aa-9a6987dda9f3.png?resizew=160)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/1e426a84-f4f5-4fc4-994d-91199b0c4d30.png?resizew=127)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/23eb10dd-351d-4aa6-8746-69461147bbfc.png?resizew=143)
(1)如图2,在
的网格中,每个小正方形的边长均为1,点
、
、
、
、
、
、
均在小正方形的顶点上,则点E是
关于点B的勾股点.
(2)如图3,
是矩形
内一点,且点
是
关于点
的勾股点,
①求证:
;
②若
,
,求
的度数.
(3)如图3,矩形
中,
,
,
是矩形
内一点,且点
是
关于点
的勾股点.
①当
时,求
的长;
②直接写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1fc377c5cd94a4fb8417d6c05c332a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/3b38d46d-5afa-44ee-a7aa-9a6987dda9f3.png?resizew=160)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/1e426a84-f4f5-4fc4-994d-91199b0c4d30.png?resizew=127)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/23eb10dd-351d-4aa6-8746-69461147bbfc.png?resizew=143)
(1)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/355bc0d6058a3dd1254ff395176ec55b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
(2)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1d267eeb09c171c3e847f0597be31c.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810242c9205006b28c6bc6612c2b1cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b8609258652778f3b498e16f25b53cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
(3)如图3,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3814287dbb60d478bffc5366f9928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b34233772c4c26d6669499d9b1f15a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
②直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b6b49238861669548285d683d5ebe0f.png)
更新时间:2020-05-11 06:41:34
|
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解答题-问答题
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【推荐1】如图,已知在Rt△ABC中,∠C=90°,AC=9,BC=12,求点C到AB的距离.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/16/2868e27b-1882-4d9d-a614-65062049b5a4.png?resizew=129)
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名校
【推荐2】如图,AB是⊙O的直径,点C是弧AB的中点,连接AC并延长至点D,使CD=AC,点E是OB上一点,且
,CE的延长线交D的延长线于点F,AF交⊙O于点H,连接BH.
![](https://img.xkw.com/dksih/QBM/2019/10/16/2313416389066752/2314031410544640/STEM/b825f328beba4f44ad5308d8cfaec5bc.png?resizew=184)
(1)求证:BD是⊙O的切线;
(2)当OB=2时,求AH的长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/738135a93ef45f6710c79a0a256f7437.png)
![](https://img.xkw.com/dksih/QBM/2019/10/16/2313416389066752/2314031410544640/STEM/b825f328beba4f44ad5308d8cfaec5bc.png?resizew=184)
(1)求证:BD是⊙O的切线;
(2)当OB=2时,求AH的长
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解答题-作图题
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【推荐1】如图1,在矩形
中,对角线
,
相交于点O,
,
,M,N分别是
,
的中点,点P是对角线
上的一个动点,设
,
,
.
小明根据学习函数的经验,分别对这两种函数随自变量的变化而变化的情况进行了探究,下面是小明探究的过程,请补充完整.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/2/96013a91-72c2-4be4-9aaf-aa0c2ebc63cc.png?resizew=338)
(1)画函数
,
的图象;
①按表中自变量的值进行取点、画图、测量,得到了
,
与x的几组对应值:
②表中m=______,n=______;
(2)在图2所给平面直角坐标系中描出以补全后的表中的各对应值为坐标的点,画出函数
,
的图象;
(3)根据画出的函数
,
的图象,解决问题:
①函数
的最小值是______;
②函数
的图象与函数
的图象的交点表示的含义是______;
③若
为等腰三角形,则AP的长约为______cm(保留一位小数).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb503f128221e12b25392d6c374722d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4b33177e18aab21d56f2b0f4a7f9a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93c568292a02fe6390a3a279da6e9f6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2a72d172c321b55939bf445c65f06f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6ef8b0da24104fc02924b067e68fc66.png)
小明根据学习函数的经验,分别对这两种函数随自变量的变化而变化的情况进行了探究,下面是小明探究的过程,请补充完整.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/2/96013a91-72c2-4be4-9aaf-aa0c2ebc63cc.png?resizew=338)
(1)画函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
①按表中自变量的值进行取点、画图、测量,得到了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
x/cm | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
![]() | 4 | 3.26 | 2.68 | 2.41 | 2.53 | m | 3.68 | 4.49 | 5.36 | 6.26 | 7.21 |
![]() | 8.54 | 7.60 | 6.65 | 5.73 | 4.84 | n | 3.26 | 2.69 | 2.41 | 2.53 | 3 |
(2)在图2所给平面直角坐标系中描出以补全后的表中的各对应值为坐标的点,画出函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
(3)根据画出的函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec71f16aa557d420d6286b7747b2cb05.png)
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解答题-问答题
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【推荐2】在矩形
中,
E、F是直线
上的两个动点,分别从A,C同时出发相向而行,速度均为每秒1个单位长度,运动时间为t秒![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cf8fc3f0f0cd7f86239f1d922697356.png)
中点,当
s时,四边形
是矩形.
(2)若在点E、F运动的同时,点G以每秒1个单位长度的速度从A出发,沿折线
运动,点H以每秒1个单位长度的速度从C出发,沿折线
运动.
①如图2,作
的垂直平分线交
于点P、Q,当四边形
的面积是矩形
面积的一半时,求t值;
②如图3,在异于G、H所在矩形边上取P、Q,使得
,顺次连接P、G、Q、H,则四边形
周长的最小值是 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/407aa1eeb15821f8ec9418005b3cb0ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cf8fc3f0f0cd7f86239f1d922697356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cbbd6f7219deca374f79d30ceedf3b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a270ec7e23fc0cc1d4b04bf1d22184.png)
(2)若在点E、F运动的同时,点G以每秒1个单位长度的速度从A出发,沿折线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0cc6293cfedec30b124ece908c4c438.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e582c41a5b79f98708e4f139ec0936d.png)
①如图2,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba48366317ebea1c9dd5e4e67e03092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cacfcf5e6f1641c9891b43d1388bc54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
②如图3,在异于G、H所在矩形边上取P、Q,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52c115c0bf8455d1feb058848aaee5b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cacfcf5e6f1641c9891b43d1388bc54.png)
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【推荐1】如图,将等腰直角三角形
纸片对折,折痕为
.展平后,再将点B折叠在边
上(不与A、C重合),折痕为
,点B在
上的对应点为M,设
与
交于点P,连接
.已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/10b369e5-1e6a-4e1b-8494-4dc38435e3a5.png?resizew=123)
(1)当M为
的中点时,求
的长;
(2)当
时,设
与
交于点O,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/10b369e5-1e6a-4e1b-8494-4dc38435e3a5.png?resizew=123)
(1)当M为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aca4f2d065a36cc99457655db276c5ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e0a525d3de13f711ace0c16a80f2282.png)
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【推荐2】已知△ABC为等边三角形,点D为直线AC上一点,连接BD,点E在线段BD上,连接AE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/3a332d11-74a1-4170-b422-90cf805cccf7.png?resizew=559)
(1)如图1,点D在线段AC上,且AC=3CD,点E在线段BD上,满足BD=3BE,当AB=9时,求AE的长;
(2)如图2,点D在线段AC上,点E为线段BD的中点,过点E作AE⊥EF交BC延长线于点F,连接AF,求证:AD=CF;
(3)如图3,将△ABE沿直线AB翻折至△ABC所在平面内,得到△ABH,连接HD交AB于点G,AC=12,当AE最小且最小值为
时,直接写出
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/3a332d11-74a1-4170-b422-90cf805cccf7.png?resizew=559)
(1)如图1,点D在线段AC上,且AC=3CD,点E在线段BD上,满足BD=3BE,当AB=9时,求AE的长;
(2)如图2,点D在线段AC上,点E为线段BD的中点,过点E作AE⊥EF交BC延长线于点F,连接AF,求证:AD=CF;
(3)如图3,将△ABE沿直线AB翻折至△ABC所在平面内,得到△ABH,连接HD交AB于点G,AC=12,当AE最小且最小值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/124699d401861bf5453c196af98b4703.png)
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