已知二次函数(m为常数).
(1)求该二次函数的对称轴(用含m的代数式表示);
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e34f42b3be15518c29e3689c9fe6d6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e46371f310e03a153a1698aad9d4c5.png)
(3)若对满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2fb40a36a293471742ce75f6b9635b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc65d6eb9b63f96d80b54ec9893aee8d.png)
更新时间:2023-05-28 12:11:56
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名校
【推荐1】已知抛物线
与
轴交于
两点(点
在点
的左边),与
轴交于点
,顶点为
.
(1)如图1,请求出
三点的坐标;
(2)点
为
轴下方抛物线
上一动点.
①如图2,若
时,抛物线的对称轴
交
轴于点
,直线
交
轴于点
,直线
交对称轴
于点
,求
的值;
②如图3,若
时,点
在
轴上方的抛物线上运动,连接
交
轴于点
,且满足
当线段
运动时,
的度数大小发生变化吗?若不变,请求出
的值若变化,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92ffcd7af3cf0f98f73212563cb612e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/8455657dde27aabe6adb7b188e031c11.png)
(1)如图1,请求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e17941712072daf4bc212f7b41b75064.png)
①如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a60b317379a8a6a43b2cdba897e3f5e7.png)
②如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e69866076dcff686a05e9e91e61e68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdf463bfc250c9ebc76e7faac6879fab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89fd1d1f0489b1b21fd9b09e8e44e8f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7911e6b0ccf733ad908022ba7e75bc88.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/a06c1a33-e45b-43c6-8ac9-dd43bcf8e997.png?resizew=489)
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【推荐2】已知抛物线
过
,
,
,
四点.
(1)若为
.
①求该抛物线的对称轴;
②比较
,
的大小,并说明理由;
(2)若为
,
,判断
是否成立,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df7fcf82e3fac415783957d0f17448f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b39dd76676a2c3a50dbef4f29baf2d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5261c14b95cb26a35e533bbd9836bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2983b2a8a66f896fe366b8bb3d6421d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2016b1f3e92f1988dd43fab6a0257044.png)
(1)若为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f591653becb48a4efd0125d8e3afd51.png)
①求该抛物线的对称轴;
②比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9314bd1d7a6e070f4f2428f9a321804e.png)
(2)若为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5332eac21b209a023cca15f1873d8d90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/322f1a044012dca2df067a843632b338.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c273f8719c937ec7f79bf68e683b3b27.png)
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解题方法
【推荐1】如图②,在
中,AC=8cm,BC=6cm,点P从点A出发,沿斜边AB向点B匀速运动,速度为
,过点P作PQ⊥AB交AC于点Q,以PQ为一边作正方形PQMN,使点N落在射线PB上,连接CM,设CQ=y,运动时间为x(s)(0<x<
),y与x函数关系如图①所示:
(1)求y与x函数关系式及a的值;
(2)设
的面积为S,求S的最大值;
(3)若
是等腰三角形,求x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da395422380a492c63651a63827066be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18a4c25fa7b7754fc55548e2497a9d6e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/1/4e9806f6-170e-46d1-8017-ec2e4cbd5f31.png?resizew=346)
(1)求y与x函数关系式及a的值;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51496e5f2d2f91c5c4aade9bc504ecfb.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51496e5f2d2f91c5c4aade9bc504ecfb.png)
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【推荐2】如图,已知抛物线y=ax2+bx+c的对称轴为直线x=﹣1,且抛物线经过A(1,0),C(0,3)两点,与x轴交于点B.
![](https://img.xkw.com/dksih/QBM/2021/8/15/2786470091685888/2786589698932736/STEM/cea75a4263b649c7af83735fd5c068eb.png?resizew=354)
(1)求抛物线的解析式;
(2)若点P从点B出发,沿着射线BC运动,速度每秒
个单位长度,过点P作直线PM∥y轴,交抛物线于点M.设运动时间为t秒.
①在运动过程中,当t为何值时,使(MA+MC)(MA﹣MC)的值最大?并求出此时点P的坐标.
②若点N同时从点B出发,向x轴正方向运动,速度每秒v个单位长度,问:是否存在t使点B,C,M,N构成平行四边形?若存在,求出t,v的值;若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/2021/8/15/2786470091685888/2786589698932736/STEM/cea75a4263b649c7af83735fd5c068eb.png?resizew=354)
(1)求抛物线的解析式;
(2)若点P从点B出发,沿着射线BC运动,速度每秒
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
①在运动过程中,当t为何值时,使(MA+MC)(MA﹣MC)的值最大?并求出此时点P的坐标.
②若点N同时从点B出发,向x轴正方向运动,速度每秒v个单位长度,问:是否存在t使点B,C,M,N构成平行四边形?若存在,求出t,v的值;若不存在,说明理由.
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【推荐1】已知抛物线
与动直线
有公共点
,
,且
.
(1)求实数t的取值范围;
(2)当t为何值时,c取到最小值,并求出c的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9da5d5f07685c91306a2080714224f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1d4ab7b826bfae9918b50af42f45e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c03b402dd13ba49e541540c88a4eb183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f2e76f9ba819575801f4e625e60e4fa.png)
(1)求实数t的取值范围;
(2)当t为何值时,c取到最小值,并求出c的最小值.
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【推荐2】已知关于
的二次函数
(
,
为常数).
(1)若
,试说明该函数图象与
轴必有两个不同的交点;
(2)若
时,函数的最大值为
,最小值为
,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557f695990cd06e28cf976156fd063ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f371d431b6c91972b742c426c8a81ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276cd2fe48cee8d001500ef2523d4ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aef0189b2b571a50a5f12122c16fd06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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【推荐1】在平面直角坐标系
中,抛物线
过点(1,1).
(1)求抛物线的表达式;
(2)点
,
在抛物线上,若
,请直接写出
的取值范围;
(3)设点
为抛物线上的一个动点,当
时,点
关于
轴的对称点都在直线
的上方,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ae5d64b57700218371a6a29d8fcc00a.png)
(1)求抛物线的表达式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e557b92593ec362d535146d489565ce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb42115ba24c72fbaffd12e96de432e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac67e9a909472ab852d38d2ec66a1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/415cb9eecf0d453b377f62da091da744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39bfed686d1fa1f4ab6e85540f288900.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cc66be3e49c75a366f3f8cc6172487a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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【推荐2】已知抛物线y=3ax2+2bx+c,
(1)若a=3k,b=5k,c=k+1,试说明此类函数图象都具有的性质;
(2)若a=
, c=2+b且抛物线在﹣2≤x≤2区间上的最小值是﹣3,求b的值;
(3)若a+b+c=1,是否存在实数x,使得相应的y的值为1,请说明理由.
(1)若a=3k,b=5k,c=k+1,试说明此类函数图象都具有的性质;
(2)若a=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(3)若a+b+c=1,是否存在实数x,使得相应的y的值为1,请说明理由.
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