如图是某家具厂的抛物线型木板余料,其最大高度为
,最大宽度为
,现计划将此余料进行切割.
,根据已经建立的平面直角坐标系,求木板边缘所对应的抛物线的函数表达式.
(2)如图
,若切割成矩形
,求此矩形的最大周长.
(3)若切割成宽为
的矩形木板若干块,然后拼接成一个宽为
的矩形,如何切割才能使拼接后的矩形的长边最长?请在备用图上画出切割方案,并求出拼接后的矩形的长边长.(结果保留到整数,参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b178474bc9008e83b4661dcfbf4e87b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a29dc67d489b45471e5179e543649e80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a24ee1f52c7638776aa93f72184c877.png)
(3)若切割成宽为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da9429d1238ea3e979dd0de49dd2b48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da9429d1238ea3e979dd0de49dd2b48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70073f33dc32172abc0aafa8472ca98e.png)
更新时间:2024-03-17 14:24:59
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较难
(0.4)
【推荐1】如图,抛物线
与x轴交于点
,
交
轴于点
.
(2)若
为抛物线对称轴上的一点,连接
,
,将
沿直线
翻折得到
,若点
恰好落在抛物线的对称轴上,求点
的坐标;
(3)在抛物线上是否存在一点
,使
是以
为底边的等腰三角形,若不存在,请说明理由;若存在,请求出点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d57173ef4cd72eb270686875dfd623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36488f7dff759ace2a27e56c3857056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4955cbb99861ac52ddbd25ba1aadf243.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)在抛物线上是否存在一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357265c532428e886a643e8e653eec9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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较难
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【推荐2】在平面直角坐标系中,设二次函数
,其中
;
(1)若函数y的图象经过点(1,﹣2),求函数y的解析式;
(2)若抛物线与x轴的两交点坐标为A,B(A点在B点的左侧),与y轴的交点为C,满足OC=2OB时,求
的值.
(3)已知点
和
在函数y的图象上,若m<n,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13df30ba1435965157d00c8453cfb38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
(1)若函数y的图象经过点(1,﹣2),求函数y的解析式;
(2)若抛物线与x轴的两交点坐标为A,B(A点在B点的左侧),与y轴的交点为C,满足OC=2OB时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea9a7657ae37143d7a673720cf4731e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532bd0bad965c65da450e7aac839e1e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
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名校
【推荐1】二次函数
与
轴两个交点为
,
,
且满足
.
(1)当
时,
,那么当
时,判断函数值
的符号,并证明你的结论;
(2)当
时,二次函数与
轴的交点为
,求三角形面积
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c70be1fa282fd307eb5509ac93ea51c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f2b1f4120365cb6ee4925fe417563f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f145f81bb9bb6e706a61a1d3f3ba63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72fb378d6bf91902efa15881985c5e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d5b159da139b50cde0d087f462aa4d.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d71f015144ffaf1faec94a259b4a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a57458464618fcf619375a93d3c66d69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e53b140fe2202bf7262bb414fa2a8553.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cbff84327e964f912a54032e76ccc9.png)
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较难
(0.4)
【推荐2】如图,抛物线
与直线AB交于点A(﹣1,0),B(4,
).点D是抛物线A,B两点间部分上的一个动点(不与点A,B重合),直线CD与y轴平行,交直线AB于点C,连接AD,BD.
(1)求抛物线的解析式;
(2)设点D的横坐标为m,△ADB的面积为S,求S关于m的函数关系式,并求出当S取最大值时的点C的坐标;
(3)当点D为抛物线的顶点时,若点P是抛物线上的动点,点Q是直线AB上的动点,判断有几个位置能使以点P,Q,C,D为顶点的四边形为平行四边形,直接写出相应的点Q的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66629831fb9f2df59a69a7dbcf6274e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533a7b702ada1dd80123e4041271d521.png)
(1)求抛物线的解析式;
(2)设点D的横坐标为m,△ADB的面积为S,求S关于m的函数关系式,并求出当S取最大值时的点C的坐标;
(3)当点D为抛物线的顶点时,若点P是抛物线上的动点,点Q是直线AB上的动点,判断有几个位置能使以点P,Q,C,D为顶点的四边形为平行四边形,直接写出相应的点Q的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/1/4071f9a1-b604-4e35-b88f-ec2861e3e697.png?resizew=227)
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【推荐1】如图,抛物线的开口向下,与x轴交于A,B两点(A在B左侧),与y轴交于点C.已知C(0,4),顶点D的横坐标为﹣
,B(1,0).对称轴与x轴交于点E,点P是对称轴上位于顶点下方的一个动点,将线段PA绕着点P顺时针方向旋转90°得到线段PM.
(1)求抛物线的解析式;
(2)当点M落在抛物线上时,求点M的坐标;
(3)连接BP并延长交抛物线于点Q,连接CQ.与对称轴交于点N.当
QPN的面积等于
QBC面积的一半时,求点Q的横坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
(1)求抛物线的解析式;
(2)当点M落在抛物线上时,求点M的坐标;
(3)连接BP并延长交抛物线于点Q,连接CQ.与对称轴交于点N.当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/12/90fd4f11-6b7a-4232-a7eb-d84e5001d308.png?resizew=304)
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【推荐2】在平面直角坐标系中,点O为坐标原点,抛物线
与x轴负半轴相交于点A,与x轴正半轴相交于点B,与y轴正半轴相交于点C,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/16/9f981c5e-b7c1-4669-ac22-14fea820b67b.png?resizew=338)
(1)求a,b的值;
(2)如图1,点P为第一象限抛物线上一点,设点P的横坐标为t,连接
、
,设
的面积为S,求S与t的函数关系式.(不要求写出自变量t的取值范围);
(3)如图2,在(2)的条件下,连接
,过点P作
交y轴于点D,过点D作y轴的垂线交第三象限内的抛物线于点Q,连接
,点F在y轴上,且在点C上方,点G为y轴负半轴上一点,且
,连接
、
,点H在
上,过点F作
轴交
延长线于点M,
,点N为
上一点,连接
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8265876b4dddf155bd19afd43d5be8a.png)
,连接
,若
,求点Q的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e195e8514f1b9d4f3a48737cec4f9559.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42be54efc6c942c65edb199876629dc2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/16/9f981c5e-b7c1-4669-ac22-14fea820b67b.png?resizew=338)
(1)求a,b的值;
(2)如图1,点P为第一象限抛物线上一点,设点P的横坐标为t,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5dd6306e00de2ae82d6605308792db.png)
(3)如图2,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/609871219aefce3bc85706106cb8b97e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b6439d044d10664cf2103e748bc8444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2765784e87779fbfb7938eae5d4c9de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4cd68cc82e90a5e2049a7ea3171b84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0185fc22b7b13b390c4b274539c132e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9d2abf13c2842f58654abf73c6b4ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8265876b4dddf155bd19afd43d5be8a.png)
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