为了弘扬耕读文化,进一步引导中学生树立正确的劳动价值观,提升劳动技能,某校搭建了一座劳动实践基地.基地中某一根黄瓜藤在钢圈的支撑下,其形状近似呈如图所示的抛物线形,黄瓜藤的藤根
和藤梢
均在地面上,以点
为坐标原点,
所在直线为
轴,过点
且垂直于
的竖直线为
轴建立如图所示的平面直角坐标系,矩形
是钢圈的支架,边
在
轴上,顶点
均在抛物线上,经测量,
,已知图中所有的点都在同一平面内.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/c915f1c0-8443-4700-a0a2-e5e598b4646c.png?resizew=168)
(1)求该抛物线的函数表达式;
(2)已知在瓜藤上的点
处有一根黄瓜,点
到
轴的距离为
,为使黄瓜不长成弯曲状(黄瓜长度大于点
到
轴的距离时,黄瓜会长成弯曲状),在黄瓜不超过多长时就应该从瓜藤上摘下?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.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/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a51949f48ee8cf746851ba779b078e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4f0004125bae5a3a07c05993fe604ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/c915f1c0-8443-4700-a0a2-e5e598b4646c.png?resizew=168)
(1)求该抛物线的函数表达式;
(2)已知在瓜藤上的点
![](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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62521010677c2f1e5a0aeadc9c28027.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
更新时间:2024-04-06 09:51:41
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【知识点】 图形问题(实际问题与二次函数)
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【推荐1】如图,某小区规划在一个长为40m,宽为26m的长方形场地
上修建三条同样宽的通道,使其中两条与
平行,另一条与
平行,其余部分种花,设通道的宽为xm,改造后花地面积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/8c677af8-51d5-41a0-8856-8a1e68af7edd.png?resizew=196)
(1)求y与x的函数表达式;
(2)若改造后花地的面积为
,求通道的宽;
(3)若要求
,求改造后花地所占面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65a20728e9a9e3018723f2a86f24f332.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/8c677af8-51d5-41a0-8856-8a1e68af7edd.png?resizew=196)
(1)求y与x的函数表达式;
(2)若改造后花地的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77acb02a0693d8c6fa434876ae6e7684.png)
(3)若要求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95842ad442c7f6d5ec4b32939b929e63.png)
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【推荐2】如图1,用
长的护栏全部建造一个靠墙(墙的长度不限)的矩形养牛场,已知此矩形养牛场的面积为
,且与墙垂直的边长为
.
![](https://img.xkw.com/dksih/QBM/2022/12/7/3125879407304704/3158889278619648/STEM/544619d09725476da0b9ec713c899533.png?resizew=445)
(1)此矩形与墙平行的边长为 m(用x来表示);
(2)求y与x之间的函数表达式,并求出此矩形面积的最大值;
(3)如图2,若建造矩形养牛场时,在平行于墙的一边上留了
的距离便于出入(不占用护栏材料),当
时,该矩形的最大面积为
,求a的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8badcdb1e5621f0ac4d9272041185a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc9dce2b9844a048044786807b34fda6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8288df5c66b22fcb3e95d97b7b66f1.png)
![](https://img.xkw.com/dksih/QBM/2022/12/7/3125879407304704/3158889278619648/STEM/544619d09725476da0b9ec713c899533.png?resizew=445)
(1)此矩形与墙平行的边长为 m(用x来表示);
(2)求y与x之间的函数表达式,并求出此矩形面积的最大值;
(3)如图2,若建造矩形养牛场时,在平行于墙的一边上留了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f81650a8bf85f3157c1dafdc43ad97c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e529e9465776af3de7a1713897fbf2c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3d8c744fcc1561f2bc2f4fed4e27c5b.png)
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【推荐3】如图1放置的木板余料,下方边缘
为
,上方边缘呈抛物线形状,最大高度为
.如图2,建立平面直角坐标系,
在
轴上,
轴正好是此木板的对称轴.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/24/097966d8-72a0-42ff-89b2-886e65d9e2ea.png?resizew=267)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/24/ecc0d062-5439-4ccd-98e3-93afadec75d3.png?resizew=305)
(1)求木板上方边缘对应的抛物线的函数表达式;
(2)如图3,若从此木板中切割出矩形
,且边
在
轴上,求此矩形的最大周长;
(3)若从此木板中横向切割出短边为
的矩形木板若干块(矩形的长边与
轴共线或平行),然后拼接成一个短边为
的矩形,如何切割才能使拼接后的矩形的长边最长?请在备用图上画出此时的切割方案,并直接写出拼接后矩形长边的最长长度.(结果保留根号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a29dc67d489b45471e5179e543649e80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b178474bc9008e83b4661dcfbf4e87b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/24/097966d8-72a0-42ff-89b2-886e65d9e2ea.png?resizew=267)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/24/ecc0d062-5439-4ccd-98e3-93afadec75d3.png?resizew=305)
(1)求木板上方边缘对应的抛物线的函数表达式;
(2)如图3,若从此木板中切割出矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a24ee1f52c7638776aa93f72184c877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a459f78e4a3516d8a8535290ede7f386.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)若从此木板中横向切割出短边为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da9429d1238ea3e979dd0de49dd2b48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da9429d1238ea3e979dd0de49dd2b48.png)
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