设二次函数
的图象与x轴的两个交点为
,抛物线的顶点为C,显然
为等腰三角形.
![](https://img.xkw.com/dksih/QBM/2016/12/23/1633715077332992/1633715077685248/STEM/8024ed2273154205a5e19aab3a017094.png?resizew=168)
(1)当
为等腰直角三角形时,求
的值;
(2)当
为等边三角形时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd69aebdafb31468eb13ce3b28a36e47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b86abc4aceb87accb38cc1131321a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2016/12/23/1633715077332992/1633715077685248/STEM/8024ed2273154205a5e19aab3a017094.png?resizew=168)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2321c8b7bfe7289f553f5d0ae6660bdf.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2321c8b7bfe7289f553f5d0ae6660bdf.png)
16-17九年级上·天津南开·期中 查看更多[2]
更新时间:2017-02-28 14:24:44
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相似题推荐
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适中
(0.65)
【推荐1】已知二次函数
.配方成y=a(x-k)2+h的形式
(1)求出抛物线的顶点坐标、对称轴、最小值;
(2)求出抛物线与x轴、y轴交点坐标
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b51ac352c2b8753abfee9e12feb5847.png)
(1)求出抛物线的顶点坐标、对称轴、最小值;
(2)求出抛物线与x轴、y轴交点坐标
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|
适中
(0.65)
【推荐2】有三张正面分别标有数字0,1,
的卡片,它们除了数字不同外其众全部相同,现将它们背面朝上,洗匀后从中抽出一张记下数字,放回洗匀后在从中随机抽出一张记下数字.
(1)请用列表或画树状图的方法,表示两次抽出卡片上的数字的所有结果;
(2)将第一次抽出的数字作为点的横坐标x,第二次抽出的数字作为点的纵坐标y,求点
落在抛物线
上的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
(1)请用列表或画树状图的方法,表示两次抽出卡片上的数字的所有结果;
(2)将第一次抽出的数字作为点的横坐标x,第二次抽出的数字作为点的纵坐标y,求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0203b006524305c3d8ee0b6c34cd872b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0781a9acdedd45dbdf6855f91ead86.png)
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(0.65)
【推荐1】已知抛物线
与
轴交于
,
两点,且
,若
(
为正整数),我们把该抛物线称为“
系抛物线”.
特例感知
(1)当
,
时,请判断抛物线
是否是“
系抛物线”,并说明理由.
推广验证
(2)若
,且
为负整数,请判断抛物线
是否是“
系抛物线”,并说明理由.
拓展应用
(3)在(2)的条件下,若
为该抛物线的顶点,且
为等腰直角三角形,求该抛物线的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98ec3d75e53b990bc8f9a4622928dd21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b583230a32b774445332490c511989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74d80e8e63fee1e3da50a6ab66ba2c93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
特例感知
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02f95a749e9ea08109add74213cd4401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
推广验证
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f05b6cb42cd73272b6c2837f042276d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
拓展应用
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4201d3bead2e48cc80052b1418f23db9.png)
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【推荐2】如图,已如二次函数
的图象与x轴相交于A、B两点(点A在点B的左侧),与y轴相交于点C.
![](https://img.xkw.com/dksih/QBM/2022/5/14/2979256689876992/2980461134725120/STEM/cf4fee9e-8566-4537-b05d-c56db2684806.png?resizew=223)
(1)求点A、B、C的坐标并直接写出直线BC的关系式;
(2)若D是第四象限内二次函数图象上任意一点,
轴于点E,与线段BC交于点F,过点F作
轴于点G,连接CD.
①求线段
的最大值;
②当
是以FC为腰的等腰三角形时,请直接写出点E的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe51f2089d22784a1d9de239fb062bee.png)
![](https://img.xkw.com/dksih/QBM/2022/5/14/2979256689876992/2980461134725120/STEM/cf4fee9e-8566-4537-b05d-c56db2684806.png?resizew=223)
(1)求点A、B、C的坐标并直接写出直线BC的关系式;
(2)若D是第四象限内二次函数图象上任意一点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d84acd3c96e20c0ce064aac125f7fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16a22a36c70e846e4ed8117064615d58.png)
①求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070ee420e8e431de153c32d43f998246.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e9b8a991d00fdd2810dda7adc54fd8.png)
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