题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061722-60391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061722-88314.jpg)
(1)求a的值.
(2)求点F的坐标.
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061723-41757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061723-88290.png)
(2)∵A(3,0),
∴OA=3.
∵四边形OABC是正方形,
∴OC=OA=3.
当y=3时,
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061723-28214.png)
解得x1=1+
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061723-35857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061723-35857.png)
∴CD=1+
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061723-35857.png)
在正方形OABC中,AB=CB.同理BD=BF.
∴AF=CD=1+
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061723-35857.png)
∴点F的坐标为(3,1+
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061723-35857.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061722-60391.png)
(2)要求点F的坐标,就要求点F到x,y轴的距离,而点F到y轴的距离等于OA=3,只要求点F到x轴的距离AF,由于正方形OABC和正方形BDEF,则OC=OA=3,AF=CD,而点D在抛物线上且点D的纵坐标为3,求出点D的横坐标即可
核心考点
试题【如图,抛物线与x轴正半轴交于点A(3,0).以OA为边在x轴上方作正方形OABC,延长CB交抛物线于点D,再以BD为边向上作正方形BDEF.(1)求a的值.(2】;主要考察你对二次函数定义等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061710-62444.png)
(1)求该公司累积获得的利润y(万元)与时间第x(月)之间的函数关系式;
(2)直接写出第x个月所获得S(万元)与时间x(月)之间的函数关系式(不需要写出计算过程);
(3)前12个月中,第几个月该公司所获得的利润最多?最多利润是多少万元?
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061710-29705.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061704-56309.png)
A.当![]() ![]() ![]() |
B.若图象与![]() ![]() |
C.当![]() ![]() ![]() |
D.若将图象向上平移1个单位,再向左平移3个单位后过点![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061648-45551.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061648-22736.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061648-41592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061649-30645.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061649-80965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061649-56023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061649-82330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061650-58045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061650-46221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061649-30645.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061650-23551.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061650-58568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061650-61283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061651-64295.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061650-46221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061651-95871.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061651-75901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061651-69758.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061652-14849.png)
(2)当点
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061650-46221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061652-79812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061652-30518.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061652-19126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061651-75901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061650-46221.png)
(3)求(2)中面积
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061652-19126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061651-75901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061652-19126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061650-46221.png)
(4)如果点
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061653-60267.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061650-46221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061652-79812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061653-20308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061651-75901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061653-54536.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061653-20308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061651-75901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061650-46221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061653-50775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061650-46221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061639-14034.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061639-39098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061640-85508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019061640-92617.png)
最新试题
- 1有一旅客携带了30公斤行李从重庆江北国际机场乘飞机去武汉,按民航规定,旅客最多可免费携带20公斤行李,超重部分每公斤按飞
- 2某校师生到距学校20千米的公路旁植树,甲班师生骑自行车先走,45分钟后,乙班师生乘汽车出发,结果两班师生同时到达,已知汽
- 3如图,已知一次函数y=kx+b的图象与反比例函数y=的图象交于A、B两点,且点A的横坐标和点B的纵坐标都是-2。求:(1
- 4Many students enjoy the play Romeo and Juliet _____ by Shake
- 5如图,水平放置的矩形金属框架,宽0.2米,上面放置一根不计电阻的直导线AB。框架电阻不计,R1=2Ω,R2=2Ω,B=0
- 6如图所示,A、B是分别盛有适量的煤油和水的相同容器,底面积均为100cm2,置于水平桌面上.现将一实心小球分别放入A、B
- 7Silk production has a long and colourful history unknown to
- 8综合性学习。(7分)2010年4月19日第七次全国国民阅读调查显示:2009年,我国18~70周岁国民中接触过数字化阅读
- 9粗心的周华在做多项式a3+2a+3加一个单项式时,误做成了减法,得到结果为a3+3,则要加的单项式为( ),正确的
- 10若反比例函数y=6x的图象过点(a,-2),则a等于______.
热门考点
- 1为了延长水果的储藏时间,往往在储藏室里加大CO2的浓度,其目的是( )A.抑制呼吸作用B.有利光合作用C.促进呼吸作用
- 2下列叙述,正确的是A.离子化合物中一定含有金属元素B.离子化合物中只含有离子键C.离子化合物中一定含有离子键D.溶于水可
- 3下列气体与空气混合后,遇明火时可能发生爆炸的是 [ ]A.氧气 B.甲烷 C.氮气 D.二氧化碳
- 4双曲线的右准线方程为 ;
- 5阅读下面的文字,完成小题。这个时代为何缺少思想家?记者:由英国《外交政策》杂志评选的2010年度 “全球百大思想家”名单
- 6某 班同学在学校网站上做了一个有关毛泽东的网页,如果在“毛泽东思想研究”栏目下再增加一个相关链接,则链接项“X”里应该是
- 7下列判断两个三角形全等的条件中,正确的是( )A.一条边对应相等B.两条边对应相等C.三个角对应相等D.三条边对应相等
- 8If the question _______ incorrectly, _______ question will b
- 9反比例函数y=-6x图象上一个点的坐标是______.
- 10化学符号是化学学习的重要工具, 用化学符号表示(1)2个铁原子 (2)硫酸铁中铁