【动手操作】将一张矩形纸片按下图操作:
步骤一:如图①,将矩形纸片
对折,使
与
重合,展平纸片,得到折痕
.
步骤二:如图②,
是
上一动点,沿
折叠纸片,使点
落在
上点
处,
的对应点为
,连接
,
.请完成:
(1)试猜想
的形状,并予以证明;
【类比操作】
步骤三:如图③,将矩形纸片
对折,使
与
重合,展平纸片,得到折痕
,沿
折叠纸片,使点
落在
上点
处,
的对应点为
,连接
,
,并延长
交
于点
.
(2)请说明:
.
步骤一:如图①,将矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/49b50357a6545cae8348e3059312f520.png)
步骤二:如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926d2094777538ba6a70ea65d5061ef7.png)
(1)试猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19343455668abab3ca3b05aa2cf616c2.png)
【类比操作】
步骤三:如图③,将矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28d6477c85c5a4ac410a884e92fbe53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926d2094777538ba6a70ea65d5061ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926d2094777538ba6a70ea65d5061ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
(2)请说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d163faa15d3d83525a1fa2fd49fcd94d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/e1da4f21-f4df-4059-b896-8fd53573ba61.png?resizew=495)
更新时间:2024-01-19 18:21:23
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】【阅读材料】小明遇到这样一个问题:如图1,点P在等边三角形
内,且
,
,求
的长.小明发现,以
为边作等边三角形
,连接
,得到
;由等边三角形的性质,可证
,得
;由已知
,可知
的大小,进而可求得
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/e94ea674-1728-4f67-9c06-545fe630d387.png?resizew=328)
(1)请回答:在图1中,
______
,
______.
【问题解决】(2)参考小明思考问题的方法,解决下面问题:
如图2,
中,
,点P在
内,且
,求①
的大小;②线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17f503d343eab0d91a09f1c00d3aed92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a1d030425a7274c4394eb978ac492de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c7a937699f989b685f285041434000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c285adec86aa04c0d808bc036af7ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efd5294ebc8964ff7ad7035bd31c8d87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17f503d343eab0d91a09f1c00d3aed92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef8133d0f3942399d3d727cec8b22c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/e94ea674-1728-4f67-9c06-545fe630d387.png?resizew=328)
(1)请回答:在图1中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/233585c63a528b59bc1adc735183d7fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2ffe216a34f1d35cc9bc608a0b56b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d0f08eb47a5429245f4c162d0355a45.png)
【问题解决】(2)参考小明思考问题的方法,解决下面问题:
如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bbd85114fc452f4b2469f755c1ad83e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6444cad556a02974bad766e94923bf35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】[问题初探】
(1)如图1,在
中,
.点D在
外,连接
,
,
,且
.过A作
于点E.则线段
,
,
数量关系是______.
【类比分析】
(2)如图2,
为等边三角形,
是等腰直角三角形,其中
,
,
是
边上的中线,连接
交
与点F.证明:
.
【学以致用】
(3)如图3,在
中,
,
,点D在
边上,过B作
交
延长线于点E,延长
至点F,连接
,使
,连接
交
于点G,若
,
,则
的面积为______.
(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f19797a50caf9c20c648a9357341f29c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
【类比分析】
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ee81929c987732fcb379802eeef7a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357d9412cb6b277a3e317d99135ab64b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8780e14ebf1efe725b819b1ff2575b9d.png)
【学以致用】
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b937442ad4cc480adc11bb143559454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9578b30c1cbef2f110d8cc51514302b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cd41bf35ad81101081bee10eabaa35c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/340be5ed534c26d3fe388318b6d371dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b103d3b19a5104e69ab3f6ab4e8d53f.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐1】在矩形ABCD的CD边上取一点E,将
沿BE翻折,得到
.
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901618706137088/2904104892882944/STEM/6ae5beecb54a43efa98a0bf5a3cb63ac.png?resizew=417)
(1)如图1,点F恰好在AD上,若
,求出AB:BC的值.
(2)如图2,E从C到D的运动过程中.
①若
,
,
的角平分线交EF的延长线于点M,求M到AD的距离:
②在①的条件下,E从C到D的过程中,直接写出M运动的路径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b80d32bd31d565cd7a5fa4b42dc2e040.png)
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901618706137088/2904104892882944/STEM/6ae5beecb54a43efa98a0bf5a3cb63ac.png?resizew=417)
(1)如图1,点F恰好在AD上,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d66b97c617d5373b7985b4c4008f61f.png)
(2)如图2,E从C到D的运动过程中.
①若
![](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/3d786ee723231d4ca87eb9d011a378b5.png)
②在①的条件下,E从C到D的过程中,直接写出M运动的路径长.
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】数学活动课上,老师给出如下定义:如果一个矩形的其中一边是另一边的
倍,那么称这个矩形为“和谐矩形”
如图
,在矩形
中,
,则矩形
是“和谐矩形”
是
边上任意一点,连接
,作
的垂直平分线分别交
于点
与
的交点为
,连接
和
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/dd6c05b2-85bd-4747-9b39-171ced49b3f2.png?resizew=527)
(1)试判断四边形
的形状,并说明理由;
(2)如图
,在“和谐矩形”
中,若
,且
是边
上一个动点,把
沿
折叠.点
落在点
处,若
恰在矩形的对称轴上,则
的长为______;
(3)如图
,记四边形
的面积为
,“和谐矩形”
的面积为
,且
,若
为常数
,且
,求
的长.
用含有
的代数式表示
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e1d0f65817ba32a732040518f41440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b929269c53a44907dba8ee298a0a522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8441850566bc9aeb46d5126f55e269b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11944f055fd806016ae3576019d4bf30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83953c651c41890dc45c9a2b20c4aaf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/dd6c05b2-85bd-4747-9b39-171ced49b3f2.png?resizew=527)
(1)试判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b6d65ee8bb2723530d0fde03472535.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d32dac853ca5e705c062a2127c5b4cc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b6d65ee8bb2723530d0fde03472535.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb89f9d2d0e26d6f0d783011f2d72f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d51692e76480c15f97a90f37523f831.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac8c94316312f093ebfc80b872a83c25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3039c774e00f6520449aa9d4b3c45464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce08128582a7e855852c03e0ac5d0487.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac8c94316312f093ebfc80b872a83c25.png)
您最近一年使用:0次