如图在矩形纸片
中,
,
,在
上取一点F,
,剪下
,将它平移至
的位置,拼成四边形
.求证:四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63fa4c6ca188ee77336376b749126b17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb6823a329628699619a39cde927510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bcb291d6e1a005a47eecdc9718b66a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827be85b8f921007a5cf9edb64bd3491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e4ceabf0daf448d295489a489a6868.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58230b030ddac1bffe759f3e37b74f9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259baad031b059b1d075e99373dbaec2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259baad031b059b1d075e99373dbaec2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/4/96b0c879-6c62-46b4-8974-c8c332b8744d.png?resizew=256)
更新时间:2023-09-03 23:34:57
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解答题-问答题
|
适中
(0.65)
【推荐1】细心观察图形,认真分析各式,然后回答问题:
![](https://img.xkw.com/dksih/QBM/2021/1/21/2640936141824000/2641472586448896/STEM/b3ba64a417da4cc29bbd0f191b09d36c.png?resizew=236)
(1)推算OA10的长和S10的值;
(2)直接用含n(n为正整数)的式子表示OAn的长和Sn的值;
(3)求S12+S22+S32+…+S102的值.
![](https://img.xkw.com/dksih/QBM/2021/1/21/2640936141824000/2641472586448896/STEM/b3ba64a417da4cc29bbd0f191b09d36c.png?resizew=236)
OA12=1;![]() ![]() ![]() | S1=![]() ![]() ![]() |
(2)直接用含n(n为正整数)的式子表示OAn的长和Sn的值;
(3)求S12+S22+S32+…+S102的值.
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【推荐2】如图,平面直角坐标系中,点
,
在反比例函数
的图象上,过
作
轴于点
,过
作
于点D.
______,
______;
(2)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0373e698d1f56ee527f5f463b418b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a6fec50da44cd6431bb3d45a4758646.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2728ebd416ed900da9442f7c8fe3ad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5862fb8bb359e111a5896f1389ac1126.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐1】如图,矩形ABCD的对角线AC=8cm,∠AOB=60°,求BC的长.
![](https://img.xkw.com/dksih/QBM/2020/11/6/2586863451144192/2593968696893440/STEM/83cf8459c7e04ecaaefb7d48fadcc7f3.png?resizew=163)
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解答题-证明题
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适中
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【推荐2】如图1,边长为2的正方形ABCD中,E是BA延长线上一点,且AE=AB,点P从点D
出发,以每秒1个单位长度沿D→C→B向终点B运动,直线EP交AD于点F,过点F作
直线FG⊥DE于点G,交AB于点R.
![](https://img.xkw.com/dksih/QBM/2012/1/3/1573320391991296/1573320420196352/STEM/04a167b2b83948b4b3a96897f05fae65.png?resizew=456)
(1)求证:AF=AR;
(2)设点P运动的时间为t,
①求当t为何值时,四边形PRBC是矩形;
②如图2,连接PB.请直接写出使△PRB是等腰三角形时t的值.
出发,以每秒1个单位长度沿D→C→B向终点B运动,直线EP交AD于点F,过点F作
直线FG⊥DE于点G,交AB于点R.
![](https://img.xkw.com/dksih/QBM/2012/1/3/1573320391991296/1573320420196352/STEM/04a167b2b83948b4b3a96897f05fae65.png?resizew=456)
(1)求证:AF=AR;
(2)设点P运动的时间为t,
①求当t为何值时,四边形PRBC是矩形;
②如图2,连接PB.请直接写出使△PRB是等腰三角形时t的值.
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,
中,
,
,
分别为边
,
的中点,
交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/2021/5/7/2715986211356672/2793091047424000/STEM/ce3439a4-1be0-49df-96c6-6a47749a6865.png?resizew=296)
(1)求证:四边形
为平行四边形;
(2)若
,求证:四边形
为菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce81a94f144092a5599044acfe39c870.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2021/5/7/2715986211356672/2793091047424000/STEM/ce3439a4-1be0-49df-96c6-6a47749a6865.png?resizew=296)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,矩形
中,点
、
分别在
、
上,将矩形
沿直线
叠,点
落在点
处,点
落在点
处,
与
交于点
.
是菱形;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9766e5eb6796dafc5ffe212afdfc43c0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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