名校
1 . 阅读材料:如图(1),在
中,
,点P在
边上,
于点
于点F,则
.(此结论不必证明,可直接应用)
如图(2),正方形
的边长为2,对角线
相交于点O,点P在
边上,
于点
于点F,则
______;
(2)【类比与推理】
如图(3),矩形
的对角线
相交于点
点P在
边上,
交
于点E,
交
于点F,求
的值;
(3)【拓展与延伸】
四边形
是半径为4的圆内接四边形,对角线
相交于点O,
,点P在弦
上,
交BD于点E,
交
于点F,当
时,试判断
的值是否为定值,若是请求出该定值并求出四边形
面积的最大值;若不是定值,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1336496362282a03b805c4d14b823308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b37625595a63cb47e1cdf9c5da40c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dff6927b60a532649f330cdecf5bf04a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0bfd5c0506342a0127b9d0a1ed9601.png)
如图(2),正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b37625595a63cb47e1cdf9c5da40c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dff6927b60a532649f330cdecf5bf04a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de1c2a266873044e21dd02c9f7e4e0e0.png)
(2)【类比与推理】
如图(3),矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a32ff7566dfbf1d22bf693f825d83ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7681c103bfed97988a516065d1c7d91a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb754e9542819c137b4c049c5cff66aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bce17597a7a6a83cd4287d424db6b56.png)
(3)【拓展与延伸】
四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46cc1c481e243ca311a6369c8313a18f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d60f55c585f1b455027202684b13e7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2103beb858805577d9402209c518828.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bce17597a7a6a83cd4287d424db6b56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c4cfb55d68dfc47530b4604f63d69c.png)
您最近一年使用:0次
2 . 综合运用
如图,在
中,
,过点
作
的垂线段
,垂足为
,连接
,且
.
的长.
(2)以点
为中心,按逆时针方向旋转
一周,使旋转后得到的
的边
恰好经过点
(点
不与点
重合),求此时旋转角的度数.
(3)在(2)的条件下,将
沿
向右平移
个单位长度,设平移后的图形与
重叠部分的面积为
,当
时,求
与
的函数关系式.
如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f1a7fd813b91c129c8542aa9cb9262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d030bc03d5e8e2bbd79de338a7c375ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7bf58e5fea1189b33cf55d86335452f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d554c15e8b2a3c9ecbe49710fb9bd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0b3e7b410f13b37f3e70e45f5e91fc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3bb972d11120544991d4b4e9c197c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9164f4960138235f404ee565bf9f7d1.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/3953cec61ac602ce5eb59b7912352179.png)
(3)在(2)的条件下,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3bb972d11120544991d4b4e9c197c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41663d9e5e18891475aeaa98794f33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0dc09e17531cf57e0f8756aa146057b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解题方法
3 . 在一次数学社团活动中,小晨同学所在的小组把两个二次项系数之和为
,对称轴相同,且图象与x轴交点也相同的二次函数,命名为“和合对称二次函数”,对应图象命名为“和合对称抛物线”,并把两个函数图象上横坐标相同的对应点称之为“和合点”,针对该构想,小展同学用二次函数
作为其中一个函数(标记该函数图象交
轴于原点
及点
)做了有关研究,请你帮他解答.
【特例感知】(1)当
时,如图,抛物线
上的点
关于与之对应的“和合对称抛物线”图像
的“和合点”分别为
,
.如下表:
②画图:在图中描出表中对应的“和合点”,再用平滑的曲线依次连接各点,得到“和合对称抛物线”图象
.
【初步探讨】(2)①当
时,若抛物线
的顶点为点
,点
对应的“和合点”为点
,则由点
、
四点所围成的四边形的面积为______;
②在同一平面直角坐标系中,当
取不同值时,通过画图发现与二次函数
对应的“和合对称抛物线”图象中,存在一条抛物线
,其顶点的横、纵坐标恰好互为相反数,请求出抛物线
的解析式.
【进阶探究】(3)若抛物线
及与它对应的“和合对称抛物线”
与直线
有且只有三个交点,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3bed8dfa15bbe3e2e244588c54c26e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
【特例感知】(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94f16d5ed858699bfea5039a7bf8ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/451a22f8a81f0d6157eae92860fa9e32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e8bfe00fbc071b7031e541757ecbed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf90af48c665ee801c05cc55914b8fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e90fce7961764ba612ea6a918795f534.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
… | ![]() | ![]() | ![]() | ![]() | ![]() | … |
… | ![]() | ![]() | ![]() | ![]() | ![]() | … |
②画图:在图中描出表中对应的“和合点”,再用平滑的曲线依次连接各点,得到“和合对称抛物线”图象
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf90af48c665ee801c05cc55914b8fd.png)
【初步探讨】(2)①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aed39f5aca78934fb383402433fe549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/3e4e38d67f9a3aa070df50a003053cf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
②在同一平面直角坐标系中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3bed8dfa15bbe3e2e244588c54c26e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf90af48c665ee801c05cc55914b8fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf90af48c665ee801c05cc55914b8fd.png)
【进阶探究】(3)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e338e0dc7a5eb21fbff996fd4c1bbed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf90af48c665ee801c05cc55914b8fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4d12362d4b8dd25813953e1c5a94b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2024-04-19更新
|
286次组卷
|
2卷引用:江西省赣州市2023-2024学年九年级下学期期中数学试题
名校
4 . 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)
您最近一年使用:0次
2024-04-19更新
|
90次组卷
|
2卷引用:陕西省西安市铁一中学2023-2024学年八年级下学期第一次月考数学试题
5 . 如图,圆柱体的母线长为2,
是上底的直径.一只蚂蚁从下底面的点A处出发爬行到上底面的点C处.设沿圆柱体侧面由A处爬行到C处的最短路径长为
,沿母线
与上底面直径
形成的折线段爬行到C处的路径的长为
.当圆柱体底面半径r变化时,为比较
与
的大小,记
,则d是r的二次函数,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee1f899fbfb468d9fe484016d7761e4.png)
A.该函数的图象都在r轴上方 | B.该函数的图象的对称轴为![]() |
C.当![]() ![]() | D.当![]() ![]() |
您最近一年使用:0次
2024-04-17更新
|
140次组卷
|
2卷引用:2024年山东省潍坊市潍城区数学一模模拟试题
6 . 某厂家特制了一批高脚杯,分为男士杯和女士杯(如图1),相关信息如下:
根据以上素材内容,尝试求解以下问题:
(1)求抛物线
和抛物线
的解析式;
(2)当杯子水平放置及杯内液体静止时,若男士杯中的液体与女士杯中的液体深度均为4cm,求两者液体最上层表面圆面积之差;(结果保留
)
(3)当杯子水平放置及杯内液体静止时,若男士杯中的液体与女士杯中的液体深度相等,两者液体最上层表面圆面积相差
,求杯中液体的深度.
素材 | 内容 |
素材1 | 如图1,这种高脚杯从下往上分为三部分: 杯托,杯脚,杯体.杯托为一个圆,水平放置时候,杯脚经过杯托圆心,并垂直任意直径,杯体的水平横截面都为圆,这些圆的圆心都在杯脚所在直线上. |
素材2 | 图2坐标系中,特制男士杯可以看作由线段![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
素材3 | 已知,图2坐标系中,![]() ![]() ![]() |
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/422210c777ac0d625bbd81cc7601bf9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57c288e6de7e470011569e2b7f870779.png)
(2)当杯子水平放置及杯内液体静止时,若男士杯中的液体与女士杯中的液体深度均为4cm,求两者液体最上层表面圆面积之差;(结果保留
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
(3)当杯子水平放置及杯内液体静止时,若男士杯中的液体与女士杯中的液体深度相等,两者液体最上层表面圆面积相差
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d22823b399c69346be0bc0b9dd2b8c2.png)
您最近一年使用:0次
2024-04-17更新
|
281次组卷
|
2卷引用:2024年辽宁省葫芦岛市建昌县中考一模数学模拟试题
7 . 如图,是一块菱形新型平面材料
,
,
,点E在
上,且
垂直于
,先沿着
切开材料,然后在四边形
内切割出一块矩形,且矩形相邻两边落在
,
上,一个顶点落在
边上.设边
上矩形的边长为
,矩形的面积为
.有下列结论:①y与x之间的函数关系式为:
;②当
时,切割出矩形后,四边形
剩余的面积为
;③若切割出的矩形材料用于某种生产时,售价为
元/
,则当
时,出售此块矩形材料的总价最大,最大值为
元.其中,正确结论的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/695525d00319665b1ad0d01717979523.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9889e15ad926dfc0dfa2a2fc33e53dd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc1cbcd6d00f0c36bad8254297d9f33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee3160fce05b551569b8c7b5de6dd8b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d740004cfdade4c185f722dadc27e15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a8c94103cbd283ac3cfceaa42af133.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ff06692c025b869a7bcdcff15dca9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6bfad3f7e65188bcf7f62ea5acdbf4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e03c716ab81f50eee011e7b659e5bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8f58755aee89fb2cf72ba518dcee2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ce13774b09ff2edddaf21a072cf60a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fc1419fe4cc7fc0e9624ffd036f3d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c198bddd2c3d495cdb556f67404417.png)
A.0 | B.1 | C.2 | D.3 |
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2024九年级下·江苏·专题练习
8 . 已知正方形的周长是C厘米,面积是S平方厘米.
(1)求S关于C的函数关系式;
(2)当
平方厘米,求正方形的边长.
(1)求S关于C的函数关系式;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7288d0b18af1a4be7f8df09af45df1c9.png)
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2024九年级下·江苏·专题练习
9 . 用长为15米的篱笆,一面靠墙(墙的长度超过15米),围成一个矩形花圃.设花圃的宽为x米,面积为y平方米,求y与x的函数解析式及函数自变量的取值范围.
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10 . 如图,
是抛物线
在第四象限的图象上一点,过点
分别向
轴和
轴作垂线,垂足分别为
、
,则四边形
周长的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b73ec2e51e8bf082ec95b5ce8348de68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14e902eb263971b466d0fcd91c56b453.png)
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