在创城活动中,某小区想借助如图所示的互相垂直的两面墙(墙体足够长),在墙角区域用28m长的篱笆围成一个矩形花园.设
m.
![](https://img.xkw.com/dksih/QBM/2022/11/9/3105697197957120/3107161070927872/STEM/b6815c9b962d4cf2b3f417a033dc3c9a.png?resizew=176)
(1)若围成花园的面积为192
,求x的值;
(2)已知在点O处一棵树,且与墙体
的距离为6m,与墙体
的距离为15m.如果在围建花园时,要将这棵树围在花园内(含边界上,树的粗细忽略不计),那么能围成的花园的最大面积是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c7a3d679b4dae63575903387a76ce45.png)
![](https://img.xkw.com/dksih/QBM/2022/11/9/3105697197957120/3107161070927872/STEM/b6815c9b962d4cf2b3f417a033dc3c9a.png?resizew=176)
(1)若围成花园的面积为192
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c901bcdfa58f0c68ad0161b0bab269.png)
(2)已知在点O处一棵树,且与墙体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
更新时间:2022-11-11 08:38:17
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【推荐1】如图,用一段长为
的篱笆围成一个一边靠墙的矩形菜园,墙长为
.设矩形菜园的边
的长为
,面积为
,其中
.
关于
的函数解析式,并求出
的取值范围;
(2)当该矩形菜园的面积为
.求边
的长;
(3)当边
的长为多少时,该矩形菜园的面积最大?最大面积是多少?
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(2)当该矩形菜园的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74d839d5a6907220b2bfecce3f792145.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)当边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】学校课外兴趣活动小组准备利用长为8m的墙
和一段长为26m的篱笆围建一个矩形的苗圃园,设平行于墙一边
长为xm.
,另三边由篱笆
围成,当苗圃园的面积为60
时,求x的值;
(2)如图2,如果矩形苗圃园的一边由墙
和一节篱笆
构成,另三边由篱笆
围成,当苗圃园的面积为60
时,求x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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(2)如图2,如果矩形苗圃园的一边由墙
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐1】如图,二次函数
的图象与
轴交于点
和点
,以
为边在
轴上方作正方形
,点
是
轴上一动点,连接
,过点
作
的垂线与
轴交于点
.
(1)求抛物线的函数关系式;
(2)当点
在线段
(点
不与
、
重合)上运动至何处时,线段
的长有最大值?并求出这个最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(1)求抛物线的函数关系式;
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
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【推荐2】为了节省材料,某水产养殖户利用水库的岸堤(岸堤足够长)为一边,用总长为
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三块矩形区域,而且这三块矩形区域的面积相等设
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的值,使得矩形
的面积是
;
(2)
为何值时,
有最大值?最大值是多少?
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(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐3】有这样一个问题探究函数
(b、c为常数)的图象和性质.元元根据学习函数的经验,对该函数的图象和性质进行了以下探究:
下面是元元的探究过程,请你补充完整
(1)根据上表信息,其中b=____,c=_____,m=______.
(2)如图,在下面平面直角坐标系中,描出以补全后的表中各对应值为坐标的点,并画出该函数的另一部分图象;
(3)观察函数图象,请写出该函数的一条性质:______.
(4)解决问题:若直线y=3n+2(n为常数)与该函数图象有3个交点时,求n的范围.
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下面是元元的探究过程,请你补充完整
x | …… | ﹣1 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | …… |
y | …… | 0 | 2.5 | 4 | m | 4 | 2.5 | 0 | 1 | …… |
(2)如图,在下面平面直角坐标系中,描出以补全后的表中各对应值为坐标的点,并画出该函数的另一部分图象;
(3)观察函数图象,请写出该函数的一条性质:______.
(4)解决问题:若直线y=3n+2(n为常数)与该函数图象有3个交点时,求n的范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/2/cedf520e-8cee-4fb0-8416-b4d31e99d750.png?resizew=339)
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