如图是个直角三角形纸片,且
:
:
:
:
,按如图的两种方法分别将其折叠,使折痕(图中虚线)过其中的一个顶点,且使该顶点所在角的两边重合,记折叠后不重叠部分面积分别为
.
(1)若
,求
的面积.
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18e2a96ad10f818c9a5ad7ef46a304c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/2/af78e8ff-61e3-4181-8a8e-9154992b97f3.png?resizew=182)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd0c00f62c22e90e7d542a2f8dd83d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd0c00f62c22e90e7d542a2f8dd83d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
22-23八年级上·湖北宜昌·期中 查看更多[3]
湖北省宜昌市枝江市枝江市实验中学2022-2023学年八年级上学期期中数学试题(已下线)专题13.25 轴对称中的折叠问题(分层练习)(基础练)-2023-2024学年八年级数学上册基础知识专项突破讲与练(人教版)(已下线)专题2.25 轴对称图形中的折叠问题(分层练习)(基础练)-2023-2024学年八年级数学上册基础知识专项突破讲与练(苏科版)
更新时间:2023-07-24 13:57:36
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解答题-作图题
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【推荐1】在
中,
是
边上的高,画出
上的高
,若
相交于点
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe4474e8dacb3811eaabe99382a16e1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/0da1f94cd38666cf340b690960b14193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://img.xkw.com/dksih/QBM/2020/4/25/2449282459590656/2449704062459904/STEM/d3e09f0721a4463684e948e474eadb91.png?resizew=104)
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【推荐2】已知,如图1,在
的正方形网格中,每个小正方形的边长均为1,点
,B,
都在格点上,若
是
的边
上的高.
(1)
的面积
____________;线段
的长为____________;线段
的长为____________.
【类比探究】如图2,在平面直角坐标系中,直线
与x轴交于点
,直线
垂直于x轴,垂足为点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
,直线
与直线
线相交于点
.
(2)写出
点,
点的坐标;
(3)尝试求出点
到直线
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fb9d60d456560e9bac66c8b20c49bb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42acd3ee01d9f843a8579ffb0b7d9d82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
【类比探究】如图2,在平面直角坐标系中,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8dfdb414d030bac149ed094e602d8a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab8a0cc6504aa4c3a38006f5394b4c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)尝试求出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/999a360f-21d9-4ebe-89d5-4046e6fcca2b.png?resizew=351)
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【推荐1】平移和翻折是初中数学两种重要的图形变换.
(一)平移运动
(1)把笔尖放在数轴的原点处,先向左移功
个单位长度,再向右移动
个单位长度,这时笔尖的位置表示什么数?用算式表示以上过程及结果是______;
A.
B.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55ef6a978d821dd22e4954263169e896.png)
C.
D.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e2e5b647e91bd94d349b58ee559657.png)
(2)一机器人从点
开始,第
次向右跳
个单位,紧接着第
次向左跳
个单位,第
次向右跳
个单位,第
次向左跳
个单位,……,依此规律跳,当它跳
次时正好落在原点上,则点
表示的数是______.
(二)翻折变换
(1)如图1,折叠纸条使数轴上表示
的点与表示
的点重合,折痕与数轴的交点表示的数是______,如果数轴上两点之间的距离为
,经过上述的折叠方式能够重合,那么左边这个点表示的数为______;
(2)如图2,若将此纸条沿
两处剪开,将中间的一段纸条对折,使其左右两端重合,这样连续对折
次后,再将其展开,则最左端的折痕与数轴的交点表示的数为______;
(3)如图3,一条数轴上有点
,其中点
表示的数分别是
,现以点
为折点,将数轴向右对折,若点
落在数轴上且到点
的距离为
,求
点表示的数.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/25/0ddc991b-9276-4bb5-b31f-e87bab8cb054.png?resizew=469)
(一)平移运动
(1)把笔尖放在数轴的原点处,先向左移功
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19aaa8740da3b42d437f33e996943a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55ef6a978d821dd22e4954263169e896.png)
C.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279bce140b0a8aade6ca31f5645b8e5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e2e5b647e91bd94d349b58ee559657.png)
(2)一机器人从点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7070546e4014f28fb2eaed777ec1dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(二)翻折变换
(1)如图1,折叠纸条使数轴上表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e946baf1316ac1f219398ecedadf6cf.png)
(2)如图2,若将此纸条沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
(3)如图3,一条数轴上有点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c57a36ea5556376413c55b893f61a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/24/a9289458-585f-4009-867b-2a3bdf6fb42d.png?resizew=173)
图3
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【推荐2】如图,长方形
沿
折叠,使点D落在
边上的F点处,若
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb8df5b509693971b8a6e434ad5e885a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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