在直角△ABC中,∠ACB=90°,AC=3,BC=4,点D、E和F分别是斜边AB、直角边AC和直角边BC上的动点,∠EDF=90°,
(2)如图2,若E点正好运动到C点,并且tan∠DCF=
,求BF的长.
(3)如图3,当
时,求
的值
(2)如图2,若E点正好运动到C点,并且tan∠DCF=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(3)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a38ec4f9a3aa965d6129a3a980d95ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557e510640bdf7bd9460d92dcd19b465.png)
更新时间:2022-04-30 11:30:31
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相似题推荐
解答题-证明题
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【推荐1】实践探究
知识应用
(1)小明按照以上方法剪出两个边长为
的全等正方形,如图②所示摆放,则四边形
的面积为______.
(2)小明发现,正方形
在绕点
转动的过程中,两个正方形重叠部分的面积与正方形
面积之间存在一定的数量关系,如图③写出该数量关系,并予以证明.
拓展延伸
小明剪了两个大小不同的等腰直角三角形
和等腰直角三角形
,且
.如图④放置,其中点
是
的中点,点
在
的延长线上,
,当点
是
的中点,
时.请直接写出两个等腰直角三角形重叠部分的面积.
知识应用
(1)小明按照以上方法剪出两个边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0463da43878c8c9848d921ecf77f1ca5.png)
(2)小明发现,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4635a4e561d862638f6818e85e74bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
拓展延伸
小明剪了两个大小不同的等腰直角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65633001f2eecfee015749ffb6fa4d1.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83b5d737d39e5ea753c6c824dd964751.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49837933cde495df24bb13ea0bb89be9.png)
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【推荐2】如图,在
中,
,
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/bf0540a3-f46c-43b3-ac6d-1782a444c573.png?resizew=182)
(1)若四边形
是正方形,求抛物线
的对称轴;
(2)若抛物线
与x轴的一个交点为
,抛物线
的对称轴为直线
,且
,求四边形
面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5dc3c15be47864978aeccce8bbae64b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/bf0540a3-f46c-43b3-ac6d-1782a444c573.png?resizew=182)
(1)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c60e0fd877676d4cbbbb19a56807f560.png)
(2)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c60e0fd877676d4cbbbb19a56807f560.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae5c9600edaa2cdc68032bea5218f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c60e0fd877676d4cbbbb19a56807f560.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1052381f3cdfd0464f54002717e17d34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9801ac7225ea5a292c4cb92a43638d15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-作图题
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适中
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【推荐1】图1、图2均是
的正方形网格,每个小正方形的顶点称为格点,线段
的端点均在格点上,回答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/d5062122-57c2-4fa7-80c4-e8c5732456dc.png?resizew=420)
(1)在图1中,
____________,
_________;
(2)在图2中请用一把无刻度的尺子,画出线段
三等分点
.(保留作图痕迹)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a96e9c2e2a15130d1d56a1d0e16b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f4021154197c8f142e5a2a8f3d9e3c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/d5062122-57c2-4fa7-80c4-e8c5732456dc.png?resizew=420)
(1)在图1中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011f96ba6baa7b250fca06a440a3d727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef628a215ea30e78bf66fa74b91f301.png)
(2)在图2中请用一把无刻度的尺子,画出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
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【推荐2】如图,在矩形
中,
,
,点P从点A出发,沿
以铅秒1个单位长度的速度向终点C运动,点Q从点C出发,沿
以每秒2个单位长度的速度向终点A运动;当点P停止运动时,点Q也随之停止,点P、Q同时出发,设点P的运动时间为t(秒).
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/16/dc4bfa5d-a8aa-4d15-9778-2f88babd7209.png?resizew=144)
(1)
的长是_________;
(2)用含t的代数式表示
的长;
(3)设点Q到
的距离为y,求y与t之间的函数关系式;
(4)若点C关于直线
的对称点为
,当
时,请直接写出直线
与
的直角边
平行或垂直时t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc0d8c4e945e4230252a7b4c97d39ad.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/16/dc4bfa5d-a8aa-4d15-9778-2f88babd7209.png?resizew=144)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)用含t的代数式表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
(3)设点Q到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
(4)若点C关于直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c052fc4d2a1d08dc58e6264f32a859f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7096fdcee49451970e84214dee5c2e5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐1】如图,四边形
内接于
,
为
的直径,
,连接
,
与
的延长线相交于点E,过点C作
垂直于
,垂足为F.
![](https://img.xkw.com/dksih/QBM/2023/4/6/3210666235920384/3211184591568896/STEM/e726fab3a0dc475e887af641b1a127da.png?resizew=125)
(1)求证:
为
的切线.
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a16dc02090b6e9263555061f14fbc8c.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/2023/4/6/3210666235920384/3211184591568896/STEM/e726fab3a0dc475e887af641b1a127da.png?resizew=125)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9bc1a0450c4fc7fcb882040b5e12725.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-作图题
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【推荐2】如图,在Rt
中,
.
(1)请用尺规作图法,在边AC上求作一点D,使得BD将
分为两个等腰三角形.(保留作图痕迹,不写作法)
![](https://img.xkw.com/dksih/QBM/2022/4/30/2976305476788224/2986056084791296/STEM/88c8ca36816e4279952abe97b0b5fcb7.png?resizew=81)
(2)在第(1)问的条件下,若
,求点D到AB的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
(1)请用尺规作图法,在边AC上求作一点D,使得BD将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2022/4/30/2976305476788224/2986056084791296/STEM/88c8ca36816e4279952abe97b0b5fcb7.png?resizew=81)
(2)在第(1)问的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
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【推荐1】如图,
为
的直径,C为
延长线上一点,D为
上一点,
.
![](https://img.xkw.com/dksih/QBM/2023/4/27/3225692072787968/3230478948188160/STEM/1dc95e680ada48f0a89adcb4ec5b3021.png?resizew=262)
(1)求证:
是
的切线;
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4473189aab32bae114182227df416c7a.png)
![](https://img.xkw.com/dksih/QBM/2023/4/27/3225692072787968/3230478948188160/STEM/1dc95e680ada48f0a89adcb4ec5b3021.png?resizew=262)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/362c1b8080dd26ccf8655d6280021870.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】如图,
是
的外接圆
的直径,
是
延长线上一点, 连接
,
, 且
.
是
的切线;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e26da987786d4d72deef7009af58cd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26ad70d2b3aac8604834d57dfc59bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55493e331f88d3d1c396e92b46c97ecd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
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