如图,抛物线
与x轴相交于A(-1,0),B(3,0)两点,与y轴相交于点C,且OC=3.
![](https://img.xkw.com/dksih/QBM/2021/12/28/2888687030272000/2949510562930688/STEM/795af7d183494909859bd58539501a57.png?resizew=173)
(1)求抛物线的表达式;
(2)若点N是第一象限内抛物线上的一个动点,连接BN、CN,求
BCN面积的最大值及此时点N的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://img.xkw.com/dksih/QBM/2021/12/28/2888687030272000/2949510562930688/STEM/795af7d183494909859bd58539501a57.png?resizew=173)
(1)求抛物线的表达式;
(2)若点N是第一象限内抛物线上的一个动点,连接BN、CN,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
21-22九年级上·山东烟台·期末 查看更多[2]
更新时间:2022-04-02 14:57:30
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【推荐1】综合与探究如图,在平面直角坐标系中,
,过点A的直线
交
于点D,交y轴于点G.
的面积为
面积的
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/f0407d6c-9ed0-4cd0-920a-aea8c2aa8626.png?resizew=256)
(1)点D的坐标为___________;
(2)过点C作
,交
交于F,垂足为E,求证:
;
(3)请探究在第一象限内是否存在点P,使
为等腰直角三角形?若存在,请直接写出点P坐标;若不存在,请说明提由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44df35c33cb1f039d07aeadb8dd44716.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bb961bd7db3adb76af2d4cedb611bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/f0407d6c-9ed0-4cd0-920a-aea8c2aa8626.png?resizew=256)
(1)点D的坐标为___________;
(2)过点C作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9df6a61c453b50f0fea4f4f640df45c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a42b2d3f719e1c94fcfaae2002dc5f3c.png)
(3)请探究在第一象限内是否存在点P,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c33903da8c8055082f950a17c8a1581a.png)
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【推荐2】(1)写出图1中函数图象的解析式y1=_________________.
(2)如图2,过直线y=3上一点P(m,3)作x轴的垂线交y1的图象于点C,交y= -x- 1于点D.
①当m>0时,试比较PC与PD的大小,并证明你的结论.
②若CD<3时,求m的取值范围.
(2)如图2,过直线y=3上一点P(m,3)作x轴的垂线交y1的图象于点C,交y= -x- 1于点D.
①当m>0时,试比较PC与PD的大小,并证明你的结论.
②若CD<3时,求m的取值范围.
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解答题-问答题
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【推荐1】如图,二次函数y=ax2+bx+3(a≠0)交x轴于A,C两点,交y轴于B点,A(﹣1,0),C(3,0).
![](https://img.xkw.com/dksih/QBM/2022/3/28/2946003040157696/2946635306475520/STEM/c7304f68-35aa-476e-a67d-be1d79ae1c1a.png?resizew=294)
(1)求二次函数的解析式.
(2)如图1,点D为直线BC上方抛物线上(不与B、C重合)一动点,过点D作DF⊥x轴于F,交BC于E,求
的最大值及此时点D的坐标.
(3)如图2,将二次函数y=ax2+bx+3沿射线AB平移
个单位得到新抛物线y′,点M为新抛物线对称轴上一点,P是y=ax2+bx+3的顶点,N为坐标平面内一点,使得以点P、A、M、N为顶点的四边形是矩形,请直接写出点N的坐标,并选择一个你喜欢的点写出求解过程.
![](https://img.xkw.com/dksih/QBM/2022/3/28/2946003040157696/2946635306475520/STEM/c7304f68-35aa-476e-a67d-be1d79ae1c1a.png?resizew=294)
(1)求二次函数的解析式.
(2)如图1,点D为直线BC上方抛物线上(不与B、C重合)一动点,过点D作DF⊥x轴于F,交BC于E,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebef97417decdcd12f9bdd5e9ddfa37.png)
(3)如图2,将二次函数y=ax2+bx+3沿射线AB平移
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
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【推荐2】点
在第一象限,二次函数
的图像经过点
,与
轴的一个交点是
(异于原点
),顶点为
.
(1)如图1,已知
,求顶点
的坐标:
(2)已知
,过点
分别作
轴、
轴的垂线,垂足为
、
,
、
相交于点
(如图2),当
与
相似时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a66c5f00b5b38a2d052354b5611970e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2503cfc7a1e1e5e9d8557f8baf7891e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(1)如图1,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3d883d7c925d974922cd11e2d4f206a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a3cc8c48bf54ec8252e5dce6867754.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a4b47633857e9262eba75f69a0d298.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://img.xkw.com/dksih/QBM/2021/1/29/2646725826453504/2676342075637760/STEM/8f566385-d803-4d90-a756-5c82a258d520.png?resizew=454)
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【推荐1】已知抛物线y=x2﹣bx+c(b,c为常数)的顶点坐标为(2,﹣1).
(1)求该抛物线的解析式;
(2)点M(t﹣1,y1),N(t,y2)在该抛物线上,当t<1时,比较y1与y2的大小;
(3)若点P(m,n)在该抛物线上,求m﹣n的最大值.
(1)求该抛物线的解析式;
(2)点M(t﹣1,y1),N(t,y2)在该抛物线上,当t<1时,比较y1与y2的大小;
(3)若点P(m,n)在该抛物线上,求m﹣n的最大值.
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【推荐2】如图,用长为
的篱笆,一面利用墙(墙的最大可用长度为
),围成中间隔有一道篱笆(平行于
)的矩形花圃,设花圈的一边
的长为
,面积为
,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/79fd4f6d-5d51-4e21-a709-679c8f5b5090.png?resizew=142)
(1)求y与x之间的函数关系式;
(2)如果围成的矩形
的边
的长度不小于
.
①求自变量x的取值范围;
②求面积y的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98195f83f04c136ef9654d768fc1b5ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d621fa409ef003869e4d9c49d5237728.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8288df5c66b22fcb3e95d97b7b66f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc9dce2b9844a048044786807b34fda6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/79fd4f6d-5d51-4e21-a709-679c8f5b5090.png?resizew=142)
(1)求y与x之间的函数关系式;
(2)如果围成的矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5810879ec2a07dea5213521ddbd9667.png)
①求自变量x的取值范围;
②求面积y的取值范围.
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【推荐1】如图,点A,B在函数
的图象上,已知点A、B的横坐标分别为
,4,直线
与y轴交于点C,连接
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/c3ae4b8b-46bb-41ae-b204-948ae9f308ef.png?resizew=226)
(1)求直线
的函数解析式;
(2)求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48f28aeccf369df5980ac787e9e313f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/c3ae4b8b-46bb-41ae-b204-948ae9f308ef.png?resizew=226)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
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【推荐2】如图,抛物线
与x轴分别交于A,B两点.
(1)求A,B,抛物线顶点M关于x轴对称的点
的坐标;
(2)抛物线与y轴的交点为C,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17d794141572c8b1e70957754f32b9eb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/25/bf906bf0-9606-4c60-aba8-48539771856a.png?resizew=150)
(1)求A,B,抛物线顶点M关于x轴对称的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da895d8bd043625a0839128252130d9.png)
(2)抛物线与y轴的交点为C,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f955e5cc9f108de6f3ca01e5eb84c52e.png)
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