如图l,四边形
中,
,
为
的中点,
为
上一动点,连接
并延长至点
,使得
,连接
、
、
、
.
![](https://img.xkw.com/dksih/QBM/2019/12/30/2366250176233472/2367073945534464/STEM/b966e107a6cd42dd8b7b088880bb1f5b.png?resizew=384)
(1)四边形
一定是___________(提醒你:填特殊四边形的名称);
(2)如图2,若
,
,
,是否存在这样的点
,使得四边形
为菱形,若存在,计算菱形
的面积;若不存在,请说明理由.
(3)如图3,若
,
,
(
),是否存在这样的点
,使得四边形
为矩形,若存在,请求出
的最大值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41aba1711910c6f533cc94319104f4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6509df0bdae7785bec2e867543b8a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e5f736b1195fef1d2d300168a795f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/2019/12/30/2366250176233472/2367073945534464/STEM/b966e107a6cd42dd8b7b088880bb1f5b.png?resizew=384)
(1)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f0f361d639589903094a392f568e4e7.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f0f361d639589903094a392f568e4e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f0f361d639589903094a392f568e4e7.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0c26071fa1ebab92b8e750fd50d828.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12b894738a0c1d7e580df8ad1161fe4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f0f361d639589903094a392f568e4e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
更新时间:2019-12-31 17:27:10
|
相似题推荐
解答题-问答题
|
困难
(0.15)
【推荐1】如图1,已知二次函数y=ax2+bx+3(a≠0)图象的对称轴为直线x=1,与y轴的交点为A,与x轴的交点为B、C,且点C(﹣1,0).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/18/117675ea-1675-4d3a-9cac-908fd2553094.png?resizew=333)
(1)求该二次函数的表达式;
(2)设点Q在y轴上,点P在抛物线上,要使B、C、P、Q为顶点的四边形是平行四边形,请直接写出点P的坐标;
(3)如图2,点D是点A关于抛物线对称轴的对称点,动点P在直线AB上方的抛物线上移动.现将△ADP绕点A顺时针旋转45°得到△AD′P′,若直线AP′的延长线交x轴于点E(1,0),求出此时点P的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/18/117675ea-1675-4d3a-9cac-908fd2553094.png?resizew=333)
(1)求该二次函数的表达式;
(2)设点Q在y轴上,点P在抛物线上,要使B、C、P、Q为顶点的四边形是平行四边形,请直接写出点P的坐标;
(3)如图2,点D是点A关于抛物线对称轴的对称点,动点P在直线AB上方的抛物线上移动.现将△ADP绕点A顺时针旋转45°得到△AD′P′,若直线AP′的延长线交x轴于点E(1,0),求出此时点P的坐标.
您最近一年使用:0次
【推荐2】如图,抛物线y=ax2+bx+c过原点,且与直线y=mx+n交于A(8,0),B(4,-3)两点,直线AB与y轴相交于点P,点M为线段OA上一动点,∠PMN为直角,边MN与AP相交于点N,设OM=t.
(1)求抛物线和直线的解析式;
(2)当t为何值时,△MAN为等腰三角形;
(3)当t为何值时,以线段PN为直径的圆与x轴相切?并求此时圆的直径PN的长.
(1)求抛物线和直线的解析式;
(2)当t为何值时,△MAN为等腰三角形;
(3)当t为何值时,以线段PN为直径的圆与x轴相切?并求此时圆的直径PN的长.
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723572879089664/2723594622803968/STEM/e185bb63-4ce9-43e4-a0c8-62b5cada559c.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐1】如图,点
分别在菱形
的各边上.
(1)如图
,若
,则四边形
一定是( )
A.梯形 B.矩形 C.菱形 D.正方形
【变式探究】
(2)如图
,若
交于点
,
分别是
上一点,
,
,
的延长线分别交在
于点
,求证:四边形
是矩形.
【深入思考】
(3)如图
,若
交于点
,且
,当
满足什么条件时,可作出两个不同矩形
,请直接写出你的结论.
(4)在(3)的条件下,设
,请探索
与
满足的关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab0ed07775b0fdcb368b696a0f65422.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d7f723f71d423839bf63687fec7384.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
A.梯形 B.矩形 C.菱形 D.正方形
【变式探究】
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aaca640804990a67999d69918cfc0a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82d579a717399137b8c6d475d33cd4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d45d96a5dcc73cc4c3a21a3cd7b8d45e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa73cc55b2da1863a5b54d66e23d144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b3826fa913d1cbe278d90d1fdc799a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6612c697aa43a72115e5dce1106c0557.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a91bcaf6fb4bda284c3fca6c103e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
【深入思考】
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70adc2860ce4117ad8a62ac799c2d02d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
(4)在(3)的条件下,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0976813c08c8d450b7dc9a6e567dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】如图①,拋物线
与
轴交于点
、
两点,与
轴交于点
,过点
的直线
与抛物线的另一交点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/6c570ed2-9b82-4584-9101-446b00cd8127.png?resizew=327)
(1)求抛物线的表达式;
(2)若点
是直线
下方抛物线上一动点,过点
作
轴,交直线
于点
,设点
的横坐标为
,
长为
,求
与
的函数关系式,并求出
的最大值;
(3)如图②,点
是抛物线的顶点,点
是
轴上一点,点
是坐标平面内一点,请直接写出当以
为边,且以点
,
,
,
为顶点的四边形是矩形时点
、
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/527adf33876b600568772d6ff0a91310.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/20aeb6068a26592e0eab53b7c8293f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15b256345d7109e081b7c895591e995d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d46675cec52ff6a40dcb070ee8df3af1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/6c570ed2-9b82-4584-9101-446b00cd8127.png?resizew=327)
(1)求抛物线的表达式;
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/386a30b86bc52e05dd2cd4673a4ed69d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(3)如图②,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐1】直线
是同一平面内的一组平行线.
(1)如图1.正方形
的4个顶点都在这些平行线上,若四条直线中相邻两条之间的距离都是1,其中点
,点
分别在直线
和
上,求正方形的面积;
(2)如图2,正方形
的4个顶点分别在四条平行线上,若四条直线中相邻两条之间的距离依次为
.
①求证:
;
②设正方形
的面积为
,求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142745631da8490df4bd1f115ca8273.png)
(1)如图1.正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f2813ee8f26cca880b6427f5f545d0.png)
(2)如图2,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6654f1a5dbb5673803cf1692ef42b95d.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d248da74313f998743a3ce8db4c33316.png)
②设正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bdb066f9b98620128389811675f9730.png)
![](https://img.xkw.com/dksih/QBM/2020/4/17/2443620043890688/2444700833767424/STEM/4f19d8c232ed4fb9983d869c355798dd.png?resizew=426)
您最近一年使用:0次
解答题-计算题
|
困难
(0.15)
名校
【推荐2】(1)如图①,在等腰
中,
,
,则△ABC的面积为
(2)如图②,在四边形ABCD中,
,
,连接AC.若四边形ABCD的面积为24,求AC的长
(3)如图③,是某公园的一个面积为
的圆形施工区示意图,公园开发部门计划在该施工地内设计一个四边形区域ABCD作为儿童户外拓展中心.按设计要求,A、B、C、D四个点都在圆上,护栏
,为了让孩子们有更好的活动体验,四边形ABCD的面积越大越好,请求出四边形ABCD面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a566b100fb2ebe3d208f9b6527934218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fffa3d9c32da53b0ea0c338012ea20c.png)
(2)如图②,在四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b6e08fde74010412a6f14ad4dfbcc9.png)
(3)如图③,是某公园的一个面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56aa319d54732dcc3086e405e426efdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ba1a9f7d640c11ec9c163588738e65.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/75740b13-19f9-41d5-9c6b-c0a2b3f18805.png?resizew=554)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
【推荐1】在
中,
,
为边
上一点,
为直线
上一点,连
、
,交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/4420e721-3ebe-435e-9b15-c7003cf0c5e0.png?resizew=518)
(1)如图1,若
,
点在线段
上,且
,过
作
,求证:
;
(2)如图2,若
,且
,求
的值;
(3)如图3,若
.若
,将线段
绕点
逆时针旋转到
,并且使得
,连接
交
于
,直接写出
= ______ .
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/4420e721-3ebe-435e-9b15-c7003cf0c5e0.png?resizew=518)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a6574405000dab3fec93b438aa2de0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47c9bff988abfbb5445c477e3f4a07ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52c86d6e1be919e521c842d5933105b3.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a429de6ad76cedc6f4210f28328e785.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/737d5c0d51f16c43875e0a65557ac375.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3716f4899e80487212cdd23b1ee8a342.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a7e75d7342e6f087370d09181b17a4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbb7817cb82a86869b8c21e2c9a2dfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.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/bb3424937834664ad8d0cb9a4e7691b7.png)
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解答题-证明题
|
困难
(0.15)
名校
【推荐2】如图,在△ABC中,点D,E分别在BC,AC上,连接AD,AD=DC,点E为AC中点,连接BE交AD于点N,BN=NE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/11/e15954b7-6ae3-41ea-8eeb-19fb9b2000f3.png?resizew=171)
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968401004027904/2968769671864320/STEM/2879a17a23344d83a65cb607ae1a8284.png?resizew=297)
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968401004027904/2968769671864320/STEM/5f3d97027f574cb1a6cc62fa1ada4bf3.png?resizew=360)
(1)如图1,若∠ANE=90°,AE=4
,求DC的长;
(2)如图2,延长BA至点M,连接ME,AN=ME,若∠ABC=45°,求证:AM+NE=
AN;
(3)如图3,延长BA至点M,连接ME,ME=3
,∠ADC=∠MEB=90°,点T为AB中点,连接TE,将△BTE沿TE翻折得到△B′TE,点F,G分别为TE,EB′上的动点(不与端点重合),连接AF,FG,连接MG交直线AE于点H,当AF+FG取得最小值时,直接写出
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/11/e15954b7-6ae3-41ea-8eeb-19fb9b2000f3.png?resizew=171)
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968401004027904/2968769671864320/STEM/2879a17a23344d83a65cb607ae1a8284.png?resizew=297)
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968401004027904/2968769671864320/STEM/5f3d97027f574cb1a6cc62fa1ada4bf3.png?resizew=360)
(1)如图1,若∠ANE=90°,AE=4
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(2)如图2,延长BA至点M,连接ME,AN=ME,若∠ABC=45°,求证:AM+NE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(3)如图3,延长BA至点M,连接ME,ME=3
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd2d09cabe330d11404cf028a532777e.png)
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解答题-问答题
|
困难
(0.15)
【推荐3】问题提出:
(1)如图1,在一间黑暗的屋子里用一盏白炽灯照射正下方如图所示的球.已知球到灯和到地面的距离相等,且球的直径是
即
,则这个球在地面上的影子的面积是______.(结果保留
)
问题探究:
(2)将两个全等的等腰直角三角形摆成如图2所示的样子(图中所有点、线都在同一平面内,点F、G在
边上),若
,求
的最小值,并证明你的结论.(结果保留根号)
问题解决:
(3)某地质勘察队,为了进行资源勘测,建立了一个四边形野外勘察基地
,如图3所示,现在此勘察基地铺设了两条道路,
,并使得
且
,现测得
米,
米,
,根据工作需要在点
处安装了一个可转动的照明灯,照明灯的两边缘光线夹角不变且与
分别交于点G、H(受实际因素影响点G、H始终在
边上),经过测量,
与
恰好互余,为了尽快完成勘察工作,勘察队需要夜间工作,那么夜间工作时,整个基地未被灯光A照到的盲区部分面积是否存在最大值?若存在,请求出最大面积是多少,如果不存在,请说明理由.
(1)如图1,在一间黑暗的屋子里用一盏白炽灯照射正下方如图所示的球.已知球到灯和到地面的距离相等,且球的直径是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e57171806f407a98dd8a796d4d2d6bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/739c4d0dc2cac3bfd94a87f1d0d0633b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
问题探究:
(2)将两个全等的等腰直角三角形摆成如图2所示的样子(图中所有点、线都在同一平面内,点F、G在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
问题解决:
(3)某地质勘察队,为了进行资源勘测,建立了一个四边形野外勘察基地
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d26633cc499d15d86afb2f54a492cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/323e6a8ea015d8263efdc1b2b9dc47a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6bb959f0a7b0b26426796ec8505b339.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c522e54f4ca7de9362b98963964ac18d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2d249d7a9fb5919efc0e123e4e7243f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5428012aa03d156773f9e63b97438d5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936af8bf3f3ed7a2d40e1211860fc347.png)
您最近一年使用:0次