如图,在菱形
中,对角线
,
相交于点
,将
绕点
按逆时针方向旋转得到
,旋转角为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
,连接
和
,
分别交
,
于点
,
.
![](https://img.xkw.com/dksih/QBM/2020/11/17/2594836972912640/2595466006528000/STEM/90204071a82f4691b5e5f165817d0ba1.png?resizew=208)
(1)求证:
;
(2)若
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
是方程
的两根,试探究
与
的数量关系和位置关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2d1edafa1fa911242aa65cbdef1aca9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a81f9d4f51576aba7fd1e2360f9e1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b435d7fc33860ae191f9111d880b40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b435d7fc33860ae191f9111d880b40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/2020/11/17/2594836972912640/2595466006528000/STEM/90204071a82f4691b5e5f165817d0ba1.png?resizew=208)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3c7f02eee6e4a73c687cbc8d37ebd39.png)
(2)若
![](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/ff9133eb63f9890e50ad6aa2bf94de6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e83a0c9561ef92dfa84e027529e0d3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b435d7fc33860ae191f9111d880b40.png)
更新时间:2020-11-18 09:52:01
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】如图,在平面直角坐标系中,直线
与
轴、
轴分别交于点A、B,直线
与
轴、
轴分别交于点
,
与
相交于点
,线段
的长是一元二次方程
的两根(OA>OC),
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/a9a5e28c-2832-4717-823b-73a272ca21a3.png?resizew=224)
(1)求点
的坐标
(2)若反比例函数
的图象经过点E,求
的值
(3)若点
在坐标轴上,在平面内是否存在一点
,使以点C、E、P、Q为顶点的四边形是矩形?若存在,请写出满足条件的点
的个数,并直接写出其中两个点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c29a7e8eea08197bf53164a560bee58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa3b68ece9e596ed7d4ec91a117218a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad9d9d196ad76180e829c4e7f0f117f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d2231c7a2875ab6d423dff3ead4069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ebfcc5a13d2cfffef586163ca8f5311.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/a9a5e28c-2832-4717-823b-73a272ca21a3.png?resizew=224)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e478787ebfeb68a5a7594dbd9eecd4.png)
(2)若反比例函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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真题
【推荐2】如图,过直线
上一点
作
轴于点
,线段
交函数
的图像于点
,点
为线段
的中点,点
关于直线
的对称点
的坐标为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/24/0c2b5bae-8d25-4c72-a497-7af82bd33ad9.png?resizew=216)
(1)求
、
的值;
(2)求直线
与函数
图像的交点坐标;
(3)直接写出不等式
的解集.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2919fac5593e8567c11ba2315ea5bef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f00d0ff8dd38da17167cf9b789eec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/888cf62de648e7c3694e6258f20d62ae.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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ce2f5e22175e3ff8ab5e0afca58f9c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/24/0c2b5bae-8d25-4c72-a497-7af82bd33ad9.png?resizew=216)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2919fac5593e8567c11ba2315ea5bef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/888cf62de648e7c3694e6258f20d62ae.png)
(3)直接写出不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2249527b64f0ec4aad4e4f61ea76de7e.png)
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解题方法
【推荐1】已知:如图,在Rt△ACB中,∠C=90°,BC=3cm,AC=3cm,点P由B点出发沿BA方向向点A匀速运动,速度为2cm/s;点Q由A点出发沿AC方向向点C匀速运动,速度为cm/s;若设运动的时间为t(s)(0<t<3),解答下列问题:
(1)如图①,连接PC,当t为何值时△APC∽△ACB,并说明理由;
(2)如图②,当点P,Q运动时,是否存在某一时刻t,使得点P在线段QC的垂直平分线上,请说明理由;
(3)如图③,当点P,Q运动时,线段BC上是否存在一点G,使得四边形PQGB为菱形?若存在,试求出BG长;若不存在请说明理由.
(1)如图①,连接PC,当t为何值时△APC∽△ACB,并说明理由;
(2)如图②,当点P,Q运动时,是否存在某一时刻t,使得点P在线段QC的垂直平分线上,请说明理由;
(3)如图③,当点P,Q运动时,线段BC上是否存在一点G,使得四边形PQGB为菱形?若存在,试求出BG长;若不存在请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/12/22/2878216580513792/2878660900659200/STEM/916b4e57-1a52-4641-8ef4-5b8d9d989188.png?resizew=458)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】已知菱形
,
是
边上一点,连接
交
于点
.
(1)如图
,当
是
中点时,求证:
;
(2)如图
,连接
,若
,
,当
为直角三角形时,求
的长;
(3)如图
,当
时,过点
作
交
的延长线于点
,连接
,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/9/9fa726c1-ea60-474c-9a6d-759d893d0c36.png?resizew=399)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51614ef7419fe2a38e1c002cfe609119.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71e6ea7333dbc78d0a7b9bc3892f940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d37c334e0b3e43d11087a1c4880c1775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935ad59079c158ea0f92018fc548e4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d96a5d40d0aea9f4398ca4d0fe9b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a33a3b993b3de8080431fa02ea8c89fc.png)
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解答题-证明题
|
较难
(0.4)
【推荐3】我们把两条中线互相垂直的三角形称为“中垂三角形”.例如图1、图2、图3中,
,
是
的中线,
,垂足为
.像
这样的三角形均为“中垂三角形”.设
,
,
.
(1)①如图1,当
,
时,
______,
______;
②如图2,当
,
时,
______,
______;
归纳证明
(2)请你观察(1)中的计算结果,猜想
,
,
三者之间的关系,用等式表示出来,并利用图3证明你发现的关系式;
拓展应用
(3)利用(2)中的结论,解答下列问题:如图4,在边长为
的菱形
中,
为对角线
,
的交点,
,
分别为线段
,
的中点,连接
,
并延长交于点
,
,
分别交
于点
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187ed13a7bd532bd39af5e5ad7493a2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df81cda12d7601d58b1d9c7c180c4d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c884a45b56bc34d79273b067c1520b2.png)
(1)①如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d3783ed9a7d67f4a30bd76d369555d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b97bb18e5ca34d22b5e827316a122a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
②如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7719aa677cf563cf295b1588eab60d96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b97bb18e5ca34d22b5e827316a122a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
归纳证明
(2)请你观察(1)中的计算结果,猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8cc0b4997cae4d8aec791a1d3923314.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a881309775c3b6a9f4ed408838666342.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/566f7614d51f0348db982a9440de8844.png)
拓展应用
(3)利用(2)中的结论,解答下列问题:如图4,在边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d1e478ff979f8557e0f169eaf22f154.png)
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解答题-证明题
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较难
(0.4)
【推荐1】如图,△ABC中,
,
是AC边上的中线,AO平分
且交BD于点O.
![](https://img.xkw.com/dksih/QBM/2022/4/18/2960881064329216/2961983067734016/STEM/ff1bf44c580642a899d81dfaa804baf5.png?resizew=169)
(1)求证:
;
(2)当△BCD是等腰三角形时,求
的余弦值;
(3)以O为圆心、OD长为半径的圆交线段BO于点E,连结CE.当△CDE与△AOB相似时,求AB:BC的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://img.xkw.com/dksih/QBM/2022/4/18/2960881064329216/2961983067734016/STEM/ff1bf44c580642a899d81dfaa804baf5.png?resizew=169)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05ffaa778ed3538c68c540367d8f2bdf.png)
(2)当△BCD是等腰三角形时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bc8e50eeccced1d7f3bc52e09a7d03.png)
(3)以O为圆心、OD长为半径的圆交线段BO于点E,连结CE.当△CDE与△AOB相似时,求AB:BC的值.
您最近一年使用:0次
解答题-证明题
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较难
(0.4)
【推荐2】如图,以△ABC的边AB为直径的⊙O与边AC相交于点D,BC是⊙O的切线,E为BC的中点,连接BD、DE.
(1)求证:DE是⊙O的切线;
(2)设△CDE的面积为S1,四边形ABED的面积为S2,若S2=5S1,求tan∠BAC的值.
(1)求证:DE是⊙O的切线;
(2)设△CDE的面积为S1,四边形ABED的面积为S2,若S2=5S1,求tan∠BAC的值.
![](https://img.xkw.com/dksih/QBM/2021/8/19/2789300951654400/2789710023376896/STEM/15cdb0ff63294d9493e813fffb1eae3a.png?resizew=191)
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