如图,点C在以AB为直径的⊙O上,BD平分∠ABC交⊙O于点D,过D作BC的垂线,垂足为E.
(1)求证:DE与⊙O相切;
(2)若AB=6,tanA=
,求BE的长;
(3)线段AB,BE,CE之间有何数量关系?写出你的结论并证明.
(1)求证:DE与⊙O相切;
(2)若AB=6,tanA=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(3)线段AB,BE,CE之间有何数量关系?写出你的结论并证明.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712437761613824/2717151584755712/STEM/93f03f74300448e8a885a2c60d130077.png?resizew=159)
2021·四川成都·二模 查看更多[2]
更新时间:2021-05-09 08:01:57
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相似题推荐
解答题-证明题
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【推荐1】如图,在
中,
是
的平分线,
,点D在AB边上,以DB为直径的半圆O经过点E.
![](https://img.xkw.com/dksih/QBM/2022/3/6/2930307840114688/2938214688808960/STEM/bd3aef2f70e1443b829f1f2c010c39d6.png?resizew=310)
(1)求证:AC是⊙O的切线.
(2)若
,⊙O的半径为2,求BE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e45f358e083cc52c0352865c54e0ac4.png)
![](https://img.xkw.com/dksih/QBM/2022/3/6/2930307840114688/2938214688808960/STEM/bd3aef2f70e1443b829f1f2c010c39d6.png?resizew=310)
(1)求证:AC是⊙O的切线.
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8862cccad5690a75279d4b09f79681c.png)
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【推荐2】如图,正方形
中,
是
的直径,点
是
上的一动点(点
不与点
,
重合,且在
左侧).
(1)尺规作图:做出点
使得
;
(2)在(1)的条件下,延长
交
于
,求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/14/67526a2a-e084-48a6-b088-c1b8ca07b0cb.png?resizew=157)
(1)尺规作图:做出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59033553b1523e37637b747b641260ab.png)
(2)在(1)的条件下,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f073e1f73d9721fdb450b5ff7aa115ac.png)
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解答题-问答题
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【推荐1】如图,抛物线
与
轴负半轴交于点
,与
轴正半轴交于点
,与
轴交于点
,直线
与
轴交于点
,与
轴交于点
,点
为点
关于
轴的对称点.
![](https://img.xkw.com/dksih/QBM/2020/12/9/2611868046704640/2621301706858496/STEM/ef21195d75fd4403aede9caae2a54fb1.png?resizew=272)
(1)求抛物线的函数表达式及抛物线顶点坐标;
(2)直线以每秒2个单位的速度沿
轴的负方向平移,平移
(
)秒后,直线
与
轴交于点
,与
轴交于点
,点
关于直线
的对称点为
.
①请直接写出点
的横坐标为______(用含字母
的代数式表示)
②当点
落在抛物线上时,请直接写出此时
为______秒,点
的坐标为______;
③点
是第二象限内一点,当四边形
为矩形时,过抛物线顶点的一条直线将这个矩形分成面积相等的两部分,请直接写出此时
为秒,这条过抛物线顶点的直线表达式为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cff000e9d8a76e260f0fcfb8bada81d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc0d82cb174d173b7e36937c3f99f591.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4db602da0ed93831964e4f31c4894d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2020/12/9/2611868046704640/2621301706858496/STEM/ef21195d75fd4403aede9caae2a54fb1.png?resizew=272)
(1)求抛物线的函数表达式及抛物线顶点坐标;
(2)直线以每秒2个单位的速度沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fff6e7e2b9f2b68b1647f6350b98dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
①请直接写出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
②当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
③点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62580674ed40c901ceda5989ba31ee0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解答题-问答题
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【推荐2】如图,在平面直角坐标系中,二次函数y=−
x2+bx−4的图象与x轴交于点A和点B(8,0),与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/2022/3/18/2939145728671744/2941765195259904/STEM/80950863-4f1f-453d-917f-0259a92d5c53.png?resizew=399)
(1)求二次函数的表达式;
(2)连接AC,找出图中与
相等的角,并说明理由;
(3)若点P是抛物线上一点,满足
,求点P的坐标;
(4)若点Q在第四象限内,且
,
,线段MQ是否存在最大值,如果存在,求出最大值;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10402e4ddd0d323cc1ae83801ae976db.png)
![](https://img.xkw.com/dksih/QBM/2022/3/18/2939145728671744/2941765195259904/STEM/80950863-4f1f-453d-917f-0259a92d5c53.png?resizew=399)
(1)求二次函数的表达式;
(2)连接AC,找出图中与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fc1df99f9a3c9e22d2041a89e2880f.png)
(3)若点P是抛物线上一点,满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9177357c4268d8d0600825bf54c5edc2.png)
(4)若点Q在第四象限内,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd70e4a3ca00411f4f4cad46f95698b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32af1da88a0323514e5ab888f449117f.png)
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解答题-证明题
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较难
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【推荐1】如图,已知:四边形
内接于
,弦
垂足为F,
.
![](https://img.xkw.com/dksih/QBM/2023/6/20/3263735665442816/3265401143533568/STEM/bce38171badc4fef93ae6fb6444b0169.png?resizew=425)
(1)如图1,求证:
;
(2)如图2,连接
,点G在
上,连接
并延长交
于点H,连接
,若
,
,求证:
;
(3)在(2)的条件下,连接GO并延长交DE于点N,AH与BC交于点K,若
,
时,如图3,求线段DC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://img.xkw.com/dksih/QBM/2023/6/20/3263735665442816/3265401143533568/STEM/bce38171badc4fef93ae6fb6444b0169.png?resizew=425)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2e305fce082bdea5f8205833179992.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07cab8f899e2bcc07e5d9b51945b8023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8e5f8366c6bd2d4db7c14a2ada089e1.png)
(3)在(2)的条件下,连接GO并延长交DE于点N,AH与BC交于点K,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c47f0aad5d77cea7600571b1dacab2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8c5bca07eec45495a8d74c82725f08.png)
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解答题-问答题
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解题方法
【推荐2】(1)如图①,圆
的半径为2,圆内有一点
,
,若弦
过点
,则弦
长度的最大值为______;最小值为______;
(2)如图②,将
放在如图所示的平面直角坐标系中,点
与原点
重合,点
在
轴的正半轴上,
,
,
.在
轴上方是否存在点
,使得
,且
?若存在,请求出点
的坐标;若不存在,请说明理由;
(3)如图③,
是李叔叔家的一块空地示意图,其中
,
米,
米.现在他利用周边地的情况,把原来的三角形地拓展成符合条件的面积尽可能大、周长尽可能长的四边形地,用来建鱼塘.若李叔叔想建的鱼塘是四边形
,且满足
,你认为李叔叔的想法能实现吗?若能,求出这个四边形鱼塘面积和周长的最大值;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12ebb7e82916a3266fbcdebff8c4de6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)如图②,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb93395f357c456cdec279686264921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1be17e0a3e51cde1f50f384198e71e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71272f10d3f406389c53e73966934380.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52575fbd8bfdbc69e160da75ae9f93b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48c5ff9c0671fb5f4afe00c5b7b1ed97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667c50b897a3e209018f0ee09d37e73d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a690535ef8766d108cce93b9e8544311.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/16/67b12d55-1671-4020-a378-9145ac23563e.png?resizew=446)
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