在
中,
,
,D为
内一点,将
绕点C按逆时针方向旋转角
得到
,点A,D的对应点分别为点B,E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/4f0799eb-b1b1-42b4-b0d6-03e896fdbbee.png?resizew=487)
(1)如图1,若A,D,E三点在同一直线上,则
______(用含
的代数式表示);
(2)如图2,若A,D,E三点在同直线上,
,过点C作
于点F,然后探究线段
之间的数量关系,并证明你的结论;
(3)图3中,连接AE,若
,
,
,将
绕点C旋转一周,当
时,
______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c029e4ab80f8a2080d59ba73841f364f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a4a514e2e338c6fa31c9938624a4a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd0c32d9f3badb7e51233dd39a39fbb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/4f0799eb-b1b1-42b4-b0d6-03e896fdbbee.png?resizew=487)
(1)如图1,若A,D,E三点在同一直线上,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4ea2f99b7326d71004ef9bd4f39d61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)如图2,若A,D,E三点在同直线上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c23e376ab222814e0029d2adb5a957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5406c9456b8042d154e16c90516ed3c.png)
(3)图3中,连接AE,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f70991469d431e7b525d374d2cefd122.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64d5fcee996a47e9cc3cfd4ba108f21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f76e37d6e6b182896ccaaa187cfe07.png)
更新时间:2023-02-07 10:35:02
|
相似题推荐
解答题-问答题
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适中
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【推荐1】如图,△ABC是边长为12cm的等边三角形,动点M、N同时从A、B两点出发,分别沿AB、BC方向匀速移动.
(1)若点M的运动速度是2cm/s,点N的运动速度是4cm/s,当N到达点C时,M、N两点都停止运动,设运动时间为t(s),当t=2时,判断△BMN的形状,并说明理由;
(2)当它们的速度都是2cm/s,当点M到达点B时,M、N两点停止运动,设点M的运动时间为t(s),则当t为何值时,△MBN是直角三角形?
(1)若点M的运动速度是2cm/s,点N的运动速度是4cm/s,当N到达点C时,M、N两点都停止运动,设运动时间为t(s),当t=2时,判断△BMN的形状,并说明理由;
(2)当它们的速度都是2cm/s,当点M到达点B时,M、N两点停止运动,设点M的运动时间为t(s),则当t为何值时,△MBN是直角三角形?
![](https://img.xkw.com/dksih/QBM/2021/1/28/2645930302554112/2650829458702336/STEM/e81bded73e014b44b1680260e1601e7e.png?resizew=154)
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解答题-证明题
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名校
【推荐2】如图①,等腰
中,
. 点D是
上一动点,点E、P分别在
延长线上,且
,
.
问题思考 在图①中,求证:
;
问题再探 若
,如图②,探究线段
之间的数量关系,并证明你的结论;
问题拓展 若
且
平分
,如图③,请直接写出
的值为 .
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a277db452e76240ec83ec6a2864bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d394f698dd542fdae97cc4f4a248e11.png)
问题思考 在图①中,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baf6b4037459f820a9833bb2174e9165.png)
问题再探 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0691e74c4aa05188027a3ad804a4147d.png)
问题拓展 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/763c82a64cb4396c57777d0f44cf78db.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/c4d61e74-60d0-403b-b17e-f3a60b96b0f7.png?resizew=431)
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【推荐1】先阅读,后解题.
已知
,求
和
的值.
解:将左边分组配方:
即
.
,
,且和为
,
且
,
,
.
利用以上解法,解下列问题:
(1)已知:
,求
和
的值.
(2)已知
,
,
是
的三边长,满足
且
为直角三角形,求
.
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/314f62584cc447d97a7eb3522bc1856d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
解:将左边分组配方:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd3845d3308d0d9afbffe0e2c4b0ffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/925b85a65ffca3b17dd9294d09190256.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a27c15a9372d1a10d1f567e33bdef7ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bca21fa854112bed37ffc7775d4c5947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93c7e6ce9ce2f0e460a23a727e349785.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c3fa03ef000b459eb50a1bcefc90686.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829f50d648f30a7c17950813c7904209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be604061cf1591f7069472269d4c9719.png)
利用以上解法,解下列问题:
(1)已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e4e3d6aa6d6a5458ef843686ce5e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f81b2dc00e899ef953ee38547112620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
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解答题-问答题
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适中
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【推荐2】有一架秋千,当它静止时,踏板离地垂直高度
,将它往前推送2m(水平距离
)时,秋千踏板离地的垂直高度
,秋干的绳索始终拉得很直,
的长
(2)直接写出将它往前推送1.5m(水平距离
时,秋千踏板离地的垂直高度
___________m,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d6b17be0abbedf61b0ab26133a7379e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c253d7e006bf012297c22dc3fa3262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66ccbb07ec7fbb9e37aa098db1c9b758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)直接写出将它往前推送1.5m(水平距离
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91efe379718d653507f6ece41a792c27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f79997547fb75e88ad1e2c66989a4a0.png)
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解答题-问答题
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【推荐1】如图,在△ABC中,AB=AC,若将△ABC绕点C顺时针旋转180°得到△FEC,连接AE、BF.
![](https://img.xkw.com/dksih/QBM/2021/12/19/2875636653457408/2876102259146752/STEM/c7d0f689-d600-4bff-b277-9e185460a897.png?resizew=120)
(1)AE与BF的关系是 ;
(2)若△ABC的面积为
cm2,S四边形ABFE= ;
(3)当∠ACB为多少度时,四边形ABFE为矩形?说明理由.
![](https://img.xkw.com/dksih/QBM/2021/12/19/2875636653457408/2876102259146752/STEM/c7d0f689-d600-4bff-b277-9e185460a897.png?resizew=120)
(1)AE与BF的关系是 ;
(2)若△ABC的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(3)当∠ACB为多少度时,四边形ABFE为矩形?说明理由.
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【推荐2】如图,在
中,
,
,
.将
绕点
逆时针方向旋转60°得到
,连接
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7502eee6f33e8c940dec63ab6473c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b5cf411c2fea8bc9f4a5fb497515a8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/020ebe1219437129358b986eb9e70bbf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/2f7385ad-a698-462d-9818-e2fa9c6be87e.png?resizew=171)
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