如图,在
中,
,
,点
为射线
上一点,连接
,将线段
绕点
顺时针旋转
得到线段
,连接
,
所在直线与射线
交于点
,且
.
(1)当点
在线段
上,
①求证:
;②求
的值;
(2)连接
,
,若
,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c7feb88cb8654765a37a3c406b4b110.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/31/3c5bcaba-f530-46d1-8f5d-c79bf39a1fd4.png?resizew=394)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/461a35dc652bbed5335f0975975e22a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d8c176e0c2b435675a3b8efab0e498d.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0258da4755df169aa2533417a2841e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
2023·辽宁鞍山·二模 查看更多[1]
更新时间:2023-05-28 17:25:57
|
相似题推荐
解答题-问答题
|
困难
(0.15)
【推荐1】如图,直线y=![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b700fa9aeb1016aa71f76e4b6bb212e.png)
x+8与x轴交于A点,与y轴交于点B,动点P从A点出发,以每秒2个单位速度沿射线AO匀速运动,同时动点Q从B点出发,以每秒1个单位的速度沿射线BA方向向点A匀速运动,当一个点停止运动,另一个点也随之停止运动,连接PQ,设运动的时间为t(秒).
(1)用t的代数式表示AP= ,AQ=
(2)当t为何值时,PQ∥OB?
(3)若点C为平面直角坐标系内一点,是否存在t值,使得以A、P、Q、C为顶点的四边形为菱形?若存在,求出Q点坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b700fa9aeb1016aa71f76e4b6bb212e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
(1)用t的代数式表示AP= ,AQ=
(2)当t为何值时,PQ∥OB?
(3)若点C为平面直角坐标系内一点,是否存在t值,使得以A、P、Q、C为顶点的四边形为菱形?若存在,求出Q点坐标,若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/3/17/2421338910285824/2422067031777280/STEM/dc735646e1f14bdc9b5c2efb154c467d.png?resizew=474)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】如图,平面直角坐标系中,已知等腰三角形
,
,点
,点
,且a,b满足
,
轴,
(2)动点P从A出发,以每秒2个单位的速度沿
方向运动,运动时间为t秒,当三角形
满足
时,求对应t的值;
(3)已知点
,且
,
,D是线段
上的动点,
,
①当
最小时,求点M坐标;
②在第①问的条件下,点T是坐标轴上的点,点Q是平面内一点,以点A、D、T、为顶点的四边形是以
为边的矩形,求点Q的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b9486ec9dca95979803bf91ca6c337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fa6e5a12543f954be1a6057c6b2ed51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37f646036b3623adeb550a607b848c8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e70c93718be1e6197b7783d62c963ae1.png)
(2)动点P从A出发,以每秒2个单位的速度沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0cc6293cfedec30b124ece908c4c438.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3df5935c893580c77ab6fa6eb0a70bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e39e730a3da1bf97ba8181158c7138a.png)
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9830acda0cc6c2fa6e398ac2c2fd4e85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9480764a0c1a90b70cac93469d30ce0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2848877b31327afc55be60e4f539550.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/770c99ac11f235913fb8a3cbc14cd5e7.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dadaee47dbf355f176fde84f1ea03197.png)
②在第①问的条件下,点T是坐标轴上的点,点Q是平面内一点,以点A、D、T、为顶点的四边形是以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐1】如图,四边形
为正方形,点E为
上的定点,点F是射线
上的动点,连接
.将点F绕点A逆时针旋转
得到点H,连接
,过点
分别作
和
的垂线交于点G,射线
与射线
交于点P.
为正方形;
(2)点F在运动过程中,判断点P的位置是否发生变化?并说明理由;
(3)连接
,探究线段
的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/449870555f4df74edd28dc83f0383f21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6e27d700becd7569ab631bc3113646a.png)
(2)点F在运动过程中,判断点P的位置是否发生变化?并说明理由;
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef6b3fa8c69a596136072482f756026a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25e688fe1ef5e387cf3192d410744f91.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
名校
【推荐2】阅读并理解下面内容,解答问题.
三角形的内心定义:三角形的三条内角平分线相交于一点,这个点叫做三角形的内心.
是
的三条内角平分线.
求证:
相交于一点.
证明:如图2,设
相交于点
,过点
分别
,垂足分别为D,E,F.
点
是
的平分线
上的一点,
,
同理,
,
.
是
的平分线,
点
在
上.
相交于一点.
请解答以下问题:
(1)如图3,在
中,
为
的内心,延长
到点
,使得
,连接
,
与
交于点
,求
的角度.
(2)如图4,
为
的内心,连接
,M为边
上一点,连接
并延长交
于点
,若
,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65f357865e82517f448c14fe6ac8de25.png)
(3)
为
的内心,
,且
,若
为线段
上的动点,连接
,将
绕点
逆时针旋转
得到
,连接
,当
取得最小值时,直接写出
的角度.
三角形的内心定义:三角形的三条内角平分线相交于一点,这个点叫做三角形的内心.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f461b1bae200d3a475948a433a571d6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f461b1bae200d3a475948a433a571d6d.png)
证明:如图2,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e4d7503a7d57ba242ad4e05c7006a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3699fa5f1068ea256f03dc382dbac2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ca634cd1689dcae34674e95e3b18f7d.png)
同理,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/947046ada03c0e6c4ac2360efc458254.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/052085b2ea5abfe5ec0ba4ad447bbfd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c237ab28e7ef8b82c24e54c71e9c9ea3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25598471c2d8cdec3e697745b9c33869.png)
请解答以下问题:
(1)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/631bef450876e192be87f02ec7ee0a01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a651eb577dbada1f29590e558d6f9fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42fa5dff377ef08e416547def489def0.png)
(2)如图4,
![](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/589c3cc1f331dbb2248b0829039df7f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30a8bd5110d7afa26d1e3e2fad49e297.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65f357865e82517f448c14fe6ac8de25.png)
(3)
![](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/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392b9e1a179a6676362679354a9e7e51.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/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a477603f3f88c3b48352b6130f9ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a477603f3f88c3b48352b6130f9ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acf077e0e7097fccf13c7b9e24679d0a.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐1】【问题探究】
(1)如图1,
、
相交于点P,连接
、
,且
,若
,
,
,则
的长为___________;
(2)如图2,
,点P是
平分线上的一个定点,点A、B分别在射线
、
上,且
,求证:四边形
的面积是定值;
【拓展运用】
(3)如图3,某创业青年小李租用一块形如四边形
的田地养蜂、产蜜与售蜜,其中
,
,
米,
米,
米.点E为入口,点E在
上,且
,小李计划过点E修一条垂直于
的笔直小路
,将田地分为两部分,四边形
区域为蜂巢区,四边形
区域为蜂源植物生长区,在点F处设立售蜜点,为了方便取蜜,计划再沿
修一条笔直的小路
,求小路
的长.(小路的宽度忽略不计,结果保留根号)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f71f070c1aa967a945113735322fae18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be41b05e11ba5eadaaed9a224b949774.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58fc6a5e71fa379d613ac1ef1cdf1048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac144685e50009fa7c9233d85e8bd85b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b15b82151bff7cc0238d2034a6129f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14e902eb263971b466d0fcd91c56b453.png)
【拓展运用】
(3)如图3,某创业青年小李租用一块形如四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1ce9c15be3efd3dd95acccf07d9671.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c99154aec25bfa23baa5343bf0c21991.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00d6e00ccf2d202793048b3d07114c3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946c16d99496d31ce4d87301a4793393.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28d6477c85c5a4ac410a884e92fbe53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/18/1d08d868-917c-45ba-8316-766ac82edb00.png?resizew=556)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
真题
【推荐2】如图,抛物线
与x轴交于点
、
,且经过点
.
(1)求抛物线的表达式;
(2)在x轴上方的抛物线上任取一点N,射线
、
分别与抛物线的对称轴交于点P、Q,点Q关于x轴的对称点为
,求
的面积;
(3)点M是y轴上一动点,当
最大时,求M的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a525534689bd2701205d4ab17574c39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c850811ba59a05e945a665196539a048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f27c65e213b6ec3f69c354977ce55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/18/ff1a3b91-4610-4c80-9301-7d6e8eaabe75.png?resizew=99)
(1)求抛物线的表达式;
(2)在x轴上方的抛物线上任取一点N,射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a42da28be159399514cc6179a96e34b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc1b9ecd75bc46dece26adc1980e5bb.png)
(3)点M是y轴上一动点,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66efb2e5b7aa63e8561be256d691fc88.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
解题方法
【推荐1】等腰
中,
,点D为AC边上一点,连接BD并延长至点F,连接AF,作
于点E.
![](https://img.xkw.com/dksih/QBM/2021/9/30/2819337728270336/2824267752914944/STEM/860701a8-066e-4b4b-a7c9-3caa5d35abf1.png)
(1)如图1,若
,
,
,求EF的值;
(2)如图2,连接AE,若AE平分
,猜想线段CE、AE、BF之间的数量关系,并证明你的猜想;
(3)如图3,点M在等腰
内,点N在等腰
外,
,
,连接CN,线段AK是
中CN边上的中线,若
,
,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68eb9e7d9280e9a1639e6cbc8b359216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b670ec1599330f6af99c600404afcb.png)
![](https://img.xkw.com/dksih/QBM/2021/9/30/2819337728270336/2824267752914944/STEM/860701a8-066e-4b4b-a7c9-3caa5d35abf1.png)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c7e48723871f06a6aeae31a2a1ff79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2aabb3232e9ffabad9def25515cbdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82773737609e65dea3c5c67099f1b10d.png)
(2)如图2,连接AE,若AE平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b400a6c61254b81d4ccc5a2a7cf4c967.png)
(3)如图3,点M在等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68eb9e7d9280e9a1639e6cbc8b359216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68eb9e7d9280e9a1639e6cbc8b359216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f59747cee312ee5140643428cae79efa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2765917637583d22a579ff075f9baa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99db03404e48d64e11ad9e953e874ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b44de608c27f5dba3367fee8b676855e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d34749152ed34ac6c459c2b98478af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac4edc4069679a1e9b238d94de73a2e0.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐2】综合与实践
问题情境:
在矩形
中,E是
边上的一点,过点E作对角线
的垂线,垂足为点F,点G是
的中点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/14/5e5fbad5-852f-4add-a816-f2a04ca5529b.png?resizew=469)
小试牛刀:
(1)如图1,若
,直接写出线段
与
的数量关系以及
的度数.
变式探究:
(2)如图2,在(1)的条件下,将图1中的
绕点B逆时针旋转,使点F落在
边的延长线上,其余条件不变,请探究(1)中的结论是否仍然成立,若成立,请证明;若不成立,请说明理由.
拓展延伸:
(3)将
绕点B逆时针旋转(旋转角小于360°),请探究下列问题:
①若将“矩形
”变为“正方形
”,其余条件不变,请在图3中画出旋转到某一位置的图形,并直接写出线段
与
的数量关系以及
的度数;
②连接
,若要保证
绕点B逆时针旋转过程中,
始终为等边三角形,写出矩形
应满足的条件.
问题情境:
在矩形
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49486f228c69a021ae92464fe0ce37f5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/14/5e5fbad5-852f-4add-a816-f2a04ca5529b.png?resizew=469)
小试牛刀:
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f170fe03fca4c750505265bd49f004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f824371a146ba1db2bf20b6f0dacc139.png)
变式探究:
(2)如图2,在(1)的条件下,将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
拓展延伸:
(3)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
①若将“矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f824371a146ba1db2bf20b6f0dacc139.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e977cb08909ddb77a8c1236bca620ac5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次