如图,用一段长为
的篱笆围成一个一边靠墙的矩形场地,若墙的最大可利用长度为
,当这块矩形场地的面积最大时,平行于墙的一边长为_________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab5f059b8406993a0d17271b1cb3905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f751f4679c27bc2b4c1e0e56d7f91708.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/24/253845af-6846-41f5-bdd2-ddda124894ca.png?resizew=225)
2023·湖北襄阳·模拟预测 查看更多[4]
2023年湖北省襄阳市东津新区中考模拟数学试题黑龙江省大庆市景园中学2023-2024学年九年级上学期月考数学试题(已下线)22.2+二次函数与实际问题(题型精讲精练)1(原卷版)云南省昆明市盘龙区昆明市第二十一中学2023-2024学年九年级上学期期中数学试题
更新时间:2023-08-28 15:10:38
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【推荐1】已知抛物线
,
,
是常数,
经过点
,下列结论:
①
:
②关于
的一元二次方程
有两个不相等的实数根;
③当
时,
随
的增大而减小;
④
为任意实数,若
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其中正确的是________ (填写序号).
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①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d19bce4c604450307f40dcbd6a9ca6c9.png)
②关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e891fe1af408f7f790734d1070466365.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c389521504a8f1446495d2c8a33a54d.png)
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④
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0f4ac6218f97f2f63cf9d6ff841cbb1.png)
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其中正确的是
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【推荐2】如图,在
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【推荐1】二次函数
与
轴分别交于
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【推荐2】二次函数
的图象如图,点O为坐标原点,点A在y轴的正半轴上,点B、C在二次函数
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