在平面内,将小棒
经过适当的运动,使它调转方向(调转前后的小棒不一定在同一条直线上),那么小棒扫过区域的面积如何尽可能地小呢?
已知小棒长度为4,宽度不计.
方案1:将小棒绕
中点O旋转180°到
,设小棒扫过区域的面积为
(即图中灰色区域的面积,下同);
方案2:将小棒先绕A逆时针旋转60°到
,再绕C逆时针旋转60°到
,最后绕B逆时针旋转60°到
,设小棒扫过区域的面积为
.
(1)①
______,
______;(结果保留
)
②比较
与
的大小.(参考数据:
,
.)
(2)方案2可优化为方案3:首次旋转后,将小棒先沿着小棒所在的直线平移再分别进行第2、3次旋转,三次旋转扫过的面积会重叠更多,最终小棒扫过的区域是一个等边三角形.
①补全方案3的示意图;
②设方案3中小棒扫过区域的面积为
,求
.
(3)设计方案4,使小棒扫过区域的面积
小于
,画出示意图并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
已知小棒长度为4,宽度不计.
方案1:将小棒绕
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c69596e1040b4b35b7c1e05e2533cc99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
方案2:将小棒先绕A逆时针旋转60°到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c69596e1040b4b35b7c1e05e2533cc99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/29/a12cae96-da4b-4e58-8065-1b8155c20895.png?resizew=529)
(1)①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3dabace330ccdd9755fbcf32d5d6343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1b625192d7398634a02ea24fa78ed87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
②比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a061dce0c7716ceab53159cd4ce7904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460317e7c26f95b9b29cfe1a89b796d6.png)
(2)方案2可优化为方案3:首次旋转后,将小棒先沿着小棒所在的直线平移再分别进行第2、3次旋转,三次旋转扫过的面积会重叠更多,最终小棒扫过的区域是一个等边三角形.
①补全方案3的示意图;
②设方案3中小棒扫过区域的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
(3)设计方案4,使小棒扫过区域的面积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
2023·江苏南京·二模 查看更多[5]
2023年江苏省南京市鼓楼区中考二模数学试题(已下线)专题24.9 弧长和扇形的面积【十四大题型】-2023-2024学年九年级数学上册举一反三系列(人教版)(已下线)专题2.9 弧长和扇形的面积【十四大题型】-2023-2024学年九年级数学上册举一反三系列(苏科版)(已下线)专题3.7 弧长和扇形的面积【十四大题型】-2023-2024学年九年级数学上册举一反三系列(浙教版)(已下线)2023四川省乐山市中考数学变式题22-26题
更新时间:2023-05-24 08:53:22
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【推荐1】若一个四位正整数
,其千位数字的5倍与后三位组成的数的和得到的数称为
的“知行数”,记为
,“知行数”百位数字的5倍与后两位组成的数的和得到的数称为t的“合一数”,记为
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,
(1)
______________;
_______________;
(2)若一个四位数
(其中
,
,
,
均为整数),且满足
能被11整除,求该四位数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e591b5e6b8c22c59f7c5e548a929db6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc8e2aad74d4b4ff2d05e9c14a99644d.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26afb4bc0626eee3a39594de614bb2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84c8f04859afb4b4a7c847e02e183d45.png)
(2)若一个四位数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4895a9cab1b2107dd74f9debd5867d0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d918a45b18b872d90115a0844ab0f5e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ed081826d4582781dab08da4878dcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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【推荐2】(1)若
满足
,求
的值;
(2)将正方形
和正方形
按如图所示摆放,点
在
边上,
与
交于点
,且
,
,长方形
的面积为24,以
为边作正方形
.设
,
用含
的代数式直接表示
和
的长;
求图中阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dca09f562dd5e4b17d4009cf970a9e4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0b9de133ac6ce02ead53b70a722bb5.png)
(2)将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb821cddd90baabb7c39f8021666cf31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6f6c04bc017ced739230d14ba31948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56a6fa8824cefba862f1a49ea5d89c1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
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【推荐3】如图,数轴上有三个点A、B、C表示的数分别是-4,-2,3.![](https://img.xkw.com/dksih/QBM/2020/11/25/2600513712611328/2602543603474432/STEM/c3942909638b4957ad260d6ef637ed28.png?resizew=278)
(1)①点B和点C之间的距离是 个单位长度;
②若使C、B两点的距离是A、B两点的距离的2倍,则需将点C向左移动 个单位长度.
(2)点A、B、C开始在数轴上运动,若点A以每秒
个长度单位的速度向左运动,同时,点B以每秒2个单位长度的速度向左运动,点C以每秒5个单位长度的速度向右运动,设运动时间为
秒.
①点A、B表示的数分别是 、 (用含有
、
的代数式表示);
②若点B、C之间的距离表示为
,点A与点B之间的距离表示为
,当
为何值时,
的值不会随着时间的变化而改变,并求此时
的值.
![](https://img.xkw.com/dksih/QBM/2020/11/25/2600513712611328/2602543603474432/STEM/c3942909638b4957ad260d6ef637ed28.png?resizew=278)
(1)①点B和点C之间的距离是 个单位长度;
②若使C、B两点的距离是A、B两点的距离的2倍,则需将点C向左移动 个单位长度.
(2)点A、B、C开始在数轴上运动,若点A以每秒
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
①点A、B表示的数分别是 、 (用含有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
②若点B、C之间的距离表示为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edf900c810371fb21297c15f86d8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31ac1def558351e2e3ed1235c570530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/980ec5a08a82751923011839ac76d7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/980ec5a08a82751923011839ac76d7dc.png)
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解答题-证明题
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【推荐1】已知:四边形
中,
,
,
分别为
中点,
相交于点
.
,求证:
.
(2)当
,
时,求
的长;
(3)当
为直角三角形时,线段
与
之间有怎样的数量关系?并说明理由.
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(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284a563413dc0532138fb2a64db8cc2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a917db13b0c7bb4a4f81c81a970454c.png)
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(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e04521727594e71dcccd976cac40e5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐2】已知在
中,
是
的中点,
是
延长线上的一点,连结
.
![](https://img.xkw.com/dksih/QBM/2021/6/15/2743265314283520/2743788946292736/STEM/c68629c9-fbe2-4a66-850d-979008eae4c7.png)
(1)如图1,若
,求
的长.
(2)过点
作
,交
延长线于点
,如图2所示.若
,求证:
.
(3)如图3,若
,是否存在实数
,当
时,
?若存在,请直接写出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce066003c0a1f0879cbca2f32802e9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ed6fa6538af83cfdc964fccda0e0cd5.png)
![](https://img.xkw.com/dksih/QBM/2021/6/15/2743265314283520/2743788946292736/STEM/c68629c9-fbe2-4a66-850d-979008eae4c7.png)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da75f870f8f8dd7d1f039ae614272dd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1912c4e0fe478ba402a887fdc759d3f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c51b3c43e110f053593ce23822aab591.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8378ac403cac1d9cf62014ee7b1cf9d0.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cac7036aa06c1d8c224f4a90647d4d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a41691c1e6215397acf47a032d66450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8378ac403cac1d9cf62014ee7b1cf9d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐3】如图1,△ABC是等边三角形,D是BC边上一点,且满足
,DE交等边三角形外角平分线CE所在直线于点E,试探究AD与DE的数量关系.
//
,交AB于点F,通过构造全等三角形,能够使问题得到解决,请直接写出AD与DE的数量关系:______;
(2)如图2,当点D是线段BC上(除B、C外)任意一点时(其它条件不变),试猜想AD与DE之间的数量关系,并说明理由;
(3)当点D在线段BC的延长线上,且满足
(其它条件不变)时,请画出图形,并直接写出△ABC与△BDE的面积之比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2d40d5cb59338d3cb1dd504bb12d107.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图2,当点D是线段BC上(除B、C外)任意一点时(其它条件不变),试猜想AD与DE之间的数量关系,并说明理由;
(3)当点D在线段BC的延长线上,且满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a1bf64ba772922fe58b5322eb4bced.png)
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【推荐1】如图,等腰直角△ABC的顶点A、B、C在正方形(每个小正方形边长为单位1)网格的格点上,∠BAC=90°,AB=AC(计算结果保留π)
(1)画出△ABC绕点A顺时针旋转90°的△AB1C1.
(2)旋转过程中线段BC的中点经过的路径长为_________.
(3)求出旋转过程中线段BC扫过的面积.
(1)画出△ABC绕点A顺时针旋转90°的△AB1C1.
(2)旋转过程中线段BC的中点经过的路径长为_________.
(3)求出旋转过程中线段BC扫过的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/edecccbc-b4ff-4b0d-a50a-470911f36487.png?resizew=126)
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【推荐2】如图1,在平面直角坐标系中,Rt△OAB的直角边OA在y轴的正半轴上,且OA=6,斜边OB=10,点P为线段AB上一动点.
![](https://img.xkw.com/dksih/QBM/2022/6/28/3010902764199936/3010922959085568/STEM/1b2e71ea2763426f98a4f4af4fb1e799.png?resizew=571)
(1)请直接写出点B的坐标;
(2)若动点P满足∠POB=45°,求此时点P的坐标;
(3)如图2,若点E为线段OB的中点,连接PE,以PE为折痕,在平面内将△APE折叠,点A的对应点为A',当PA'⊥OB时,求此时点P的坐标;
(4)如图3,若F为线段AO上一点,且AF=2,连接FP,将线段FP绕点F顺时针方向旋转60°得线段FG,连接OG,当OG取最小值时,请直接写出OG的最小值和此时线段FP扫过的面积.
![](https://img.xkw.com/dksih/QBM/2022/6/28/3010902764199936/3010922959085568/STEM/1b2e71ea2763426f98a4f4af4fb1e799.png?resizew=571)
(1)请直接写出点B的坐标;
(2)若动点P满足∠POB=45°,求此时点P的坐标;
(3)如图2,若点E为线段OB的中点,连接PE,以PE为折痕,在平面内将△APE折叠,点A的对应点为A',当PA'⊥OB时,求此时点P的坐标;
(4)如图3,若F为线段AO上一点,且AF=2,连接FP,将线段FP绕点F顺时针方向旋转60°得线段FG,连接OG,当OG取最小值时,请直接写出OG的最小值和此时线段FP扫过的面积.
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【推荐1】如图,在
中,
,以AB为直径作
,交AC边于点D,E是BC的中点,连接DE并延长交AB延长线于点F.
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963490881290240/2966314538606592/STEM/c5f07b47-d4ad-4ba3-97e6-4fbec7737fbe.png?resizew=261)
(1)求证:DF是
的切线:
(2)若
,
,求图中阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963490881290240/2966314538606592/STEM/c5f07b47-d4ad-4ba3-97e6-4fbec7737fbe.png?resizew=261)
(1)求证:DF是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7fb87890d12b6f1125057d9fb3ac274.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/613dedf2d90e58591b7ac4a250ac7b5d.png)
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【推荐2】如图,在
ABC中,∠ABC=60°,⊙O是
ABC的外接圆,过点A作⊙O的切线,交CO的延长线于点E,CE交⊙O于点D.
(1)求∠ACD的度数;
(2)若AC=2
,求DE的长;
(3)在(2)的条件下,求图中阴影部分面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)求∠ACD的度数;
(2)若AC=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(3)在(2)的条件下,求图中阴影部分面积.
![](https://img.xkw.com/dksih/QBM/2020/7/29/2516094554636288/2517047456522240/STEM/6758ecc60e2e41c696a29ed6315fbe14.png?resizew=194)
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