如图1,点
是
的平分线上的一点,点
、
分别在
的两边
、
上,若
.
、
之间的数量关系________;
(2)如图2,若
,
,求四边形
的面积;
(3)如图3,在(2)的条件下,连接
,
的面积是否有最大值?若有请求出
面积的最大值,若没有请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8161c0d1b056e1af9db936205f3f7f66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9eb456c912e01458c19b06e83a5c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea51de5ca1c2879e7a767a60ce4624cd.png)
(3)如图3,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
更新时间:2024-04-19 13:27:46
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【推荐1】用一块宽度为
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【推荐2】某小区为了改善居住环境,准备修建一个巨型花园ABCD,为了节约材料并种植不同花卉,决定花园一边靠墙,三边用栅栏围住,中间用一段垂直于墙的栅栏隔成两块.已知所用栅栏的总长为60米,墙长为30米,设花园垂直于墙的一边的长为
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![](https://img.xkw.com/dksih/QBM/2019/12/12/2353465503907840/2356996921016320/STEM/349a985858b9405f918057a5fd947372.png?resizew=103)
(1)若平行于墙的一边长为
米,直接写出
与
的函数关系式及自变量
的取值范围;
(2)当
为何值时,这个矩形花园的面积最大?最大值为多少?(栅栏占地面积忽略不计)
(3)当这个花园的面积不小于288平方米时,试结合函数图象,直接写出
的取值范围
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2019/12/12/2353465503907840/2356996921016320/STEM/349a985858b9405f918057a5fd947372.png?resizew=103)
(1)若平行于墙的一边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2019/12/12/2353465503907840/2356996921016320/STEM/1db3aa3c31244db8a603ed9cd406a9d0.png?resizew=13)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)当这个花园的面积不小于288平方米时,试结合函数图象,直接写出
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名校
【推荐1】如图,BE=CF,DE⊥AB的延长线于点E,DF⊥AC于点F,且DB=DC.
求证:AD是∠BAC的平分线.
求证:AD是∠BAC的平分线.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/28/620ee7e7-0a98-4658-a73c-a754a3127574.png?resizew=176)
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【推荐2】如图,四边形
中,
平分
,
,
和
互补.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/7124d2d5-b772-4325-ab5c-fa0fed2d664a.png?resizew=160)
(1)求证:
;
(2)若
,
,求出
的长度.
![](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/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/7124d2d5-b772-4325-ab5c-fa0fed2d664a.png?resizew=160)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a16dc02090b6e9263555061f14fbc8c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f979d5406af7e951f386dbb55a9617eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07dd741bc3f02d8552afbcf63fba4fb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐1】如图,在等边
中,点
(2,0),点
是原点,点
是
轴正半轴上的动点,以
为边向左侧作等边
,当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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【推荐2】某同学在学习过程中得出两个结论,结论1:在直角三角形中,夹
内角的两边长是2倍的关系.结论2:在一个三角形中,如果夹
内角的两边长是2倍的关系,那么这个三角形是直角三角形.
(1)上述结论1_________.(填写“正确”或“不正确”)
(2)上述结论2正确吗?如果你认为正确,请你给出证明;如果你认为不正确,请你给出反例.
(3)等边三角形
的边长为4,点
分别从点
同时出发,分别沿边
运动,速度均为1个单位长度/秒,当点
到达点
时两点均停止运动,则当运动时间是多少秒时,
是直角三角形?请你给出解题过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
(1)上述结论1_________.(填写“正确”或“不正确”)
(2)上述结论2正确吗?如果你认为正确,请你给出证明;如果你认为不正确,请你给出反例.
(3)等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
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【推荐1】如图,在四边形
中,
,对角线
与
相交于点
.
,求证:四边形
是菱形;
(2)在(1)的条件下,过点
作
交
于点
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdcfd7dc82afe5e59bf6d839bec387ad.png)
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(2)在(1)的条件下,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f9cb93947d668d2e054348103f8bf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/695c081f53e0c36756c7a7a7625b3d47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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【推荐2】如图1,平行四边形
在平面直角坐标系中,其中点
的坐标分别是
,
,点
在
轴正半轴上,点
为
的中点,点
在
轴正半轴上,
(1)点
的坐标为______,点
的坐标为_______.
(2)求点
的坐标.
(3)如图2,根据(2)中结论,将
顺时针旋转
至
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65436512ecbaefba4ac8123c55094211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd243fab0af865af67a2ab817e909cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dffbdc6dc7c0479261716cddd2c3f26.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)如图2,根据(2)中结论,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7516bfacb88ea94d2d5156408e9ee25e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2c176818b670606adc5edeb8333d61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/7/6aea1a23-7c03-46d3-bc76-fcfe7096dfb2.png?resizew=334)
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