题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034429-30989.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034429-57183.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
答案
解析
试题分析:y=x2﹣4x﹣1=x2﹣4x+4﹣5=(x﹣2)2﹣5.
故选D.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034425-23193.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034416-63795.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034416-93234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034417-53753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034417-24550.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034417-91781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034417-37752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034418-72164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034418-25173.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034416-93234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034418-14121.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034418-34109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034418-43191.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034419-56485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034416-93234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034417-24550.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034419-59804.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034419-59804.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034419-56485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034419-21688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034419-35037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034408-46991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034408-84867.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034404-29550.jpg)
(1)求出这条抛物线;
(2)求它与x轴的交点和抛物线顶点的坐标;
(3)x取什么值时,抛物线在x轴上方?
(4)x取什么值时,y的值随x的增大而减小?
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019034359-46942.png)
(1)求y关于x的函数关系式,并写出x的取值范围;
(2)求△PBQ的面积的最大值.
最新试题
- 1下列实验操作中,不能用于物质分离的是( ) A.B.C. D.
- 2友情提示:请同学们做完上面考题后,再认真检查一遍,估计一下你的得分情况,如果你全卷得分低于90分(及格线),则本题的得分
- 3隔离传染病病人的主要目的是( )A.控制传染源B.切断传播途径C.保护易感者D.积极治疗患者
- 4阅读理解。 Eight-year-old Jesse Arbogast was playing in the s
- 5某同学在用试管加热固体物质的过程中,出现试管炸裂现象,请你猜测一下造成这种现象的可能原因有哪些?(至少写出三种)①___
- 6Employers often give jobs to _______ they believe has work e
- 7为维护消费者的合法权益,全国工商管理机关每年都查处一些侵权案件,为消费者挽回了经济损失,这体现了[ ]①国家维护
- 8百合是一种美丽高贵的观赏植物,深得大众的喜爱。它的特征是 [ ]A.有花,两片子叶,叶脉一般具有网状脉 B.无
- 9读下图,回答1~2题。 1、H经线穿越的我国大地形区有[ ]A、内蒙古高原、黄土高原、青藏高原、云贵高原B、内蒙
- 10名句默写(每空1分,共6分)小题1:恰同学少年,风华正茂;书生意气, 。小题2:寻梦?
热门考点
- 1如图所示,在倾角α=300的光滑斜面上,有一长L=0.4米的细绳,一端固定在O点,另一端拴一质量m=0.2千克的小球。使
- 2某水库大坝横断面是梯形ABCD ,坝顶宽CD=3米,斜坡AD=16米,坝高8米,斜坡BC的坡度=1∶3,求斜坡AD的坡角
- 3— Can you tell me _____ it is from home to school? — Sure. I
- 4如图所示电路中,电压表测的是______(填“L1”、“L2”或“电源“)两端的电压.若电源电压为4.5V,电压表的示数
- 5为了验证酵母菌的发酵作用,李娜同学做了如下的实验,实验步骤如下:①将一定量的干酵母和蔗糖放入下图中的瓶内,并加入一些温开
- 6已知集合A={1.3. },B={1,m} ,AB=A, 则m=A.0或B.0或3 C.1或D.1或3
- 7Don"t fight ______ classmates in school. Do you agree ______
- 8下列词语中加点的字,读音全都正确的一组是( )A.熏陶(tāo)葡萄(táo)稂(láng)莠书声琅琅(láng)B
- 9求方程2x+3y=15的所有正整数解。
- 10在体积一定的密闭容器中进行如下反应:X2(g)+2Y2(g)2Z(g),已知X2、Y2、Z的起始浓度分别为a mol/L