题目
题型:不详难度:来源:
(1)当t=1时,正方形EFGH的边长是 ,当t=3时,正方形EFGH的边长是 ;
(2)当0<t≤2时,求S与t的函数关系式;
(3)直接答出:在整个运动过程中,当t为何值时,S最大?最大面积是多少?
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063701-83280.jpg)
答案
(2)①0<t≤
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063701-76489.png)
S=2t×2t=4t2;
②当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063701-76489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063702-52460.png)
S=4t2
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063702-40149.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063702-60730.png)
③当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063702-52460.png)
S=
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063702-21836.png)
(3)当t=5时,面积最大;最大面积是
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063703-19116.png)
解析
(2)分三种情况讨论;
(3)根据以上解析式求出最大值。
核心考点
试题【如图,在Rt△ABC中,∠C=90°,AC=8,BC=6,点P在AB上,AP=2,点E,F同时从点P出发,分别沿PA,PB以每秒1个单位长度的速度向点A,B匀速】;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/20191019/20191019063653-94961.png)
(1)若抛物线过点C,A,
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063653-69062.png)
(2)求平行四边形ABOC和平行四边形
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063653-94961.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063653-37017.png)
(3)点M是第一象限内抛物线上的一动点,间:点M在何处时△
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063653-33667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063653-30014.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063647-95146.png)
(1)点A的坐标为_____________;B的坐标______________(用n表示);
(2)abc= .
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063648-73878.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063642-70462.png)
](1)求射线AD的解析式;
(2)在线段AB上是否存在点E,使△OCG为等腰三角形?
若存在,求正方形EFGH的边长;若不存在,请说明理由;
(3)设正方形EFGH与△ABD重叠部分面积为S,求S与t的函数关系式.
A.b2﹣4ac<0 | B.abc<0 | C.![]() | D.a﹣b+c<0 |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063639-67111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063620-81566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063620-59954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063620-24686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063620-66922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063620-20724.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063620-14461.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063620-51074.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063621-32128.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063620-14461.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063621-37291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063621-85180.png)
(1)求该拋物线的解析式,并判断
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063621-90808.png)
(2)在
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063620-24686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063621-28004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063620-66922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063621-85180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063621-28004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063620-51074.png)
出
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063621-28004.png)
(3)在此拋物线上是否存在点P,使得以
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063620-66922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063621-85180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063620-51074.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063621-78642.png)
(4)出
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063621-78642.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019063621-82762.png)
最新试题
- 1— Did you scold him for his carelessness?— Yes, but_______
- 2下列各组物质按照碱性递减顺序排列的是 [ ]A. LiOH、NaOH、CsOH B. Ba(OH)2、Ca(OH
- 3阅读下列材料:材料一:“聪明睿智,光被遐荒,建此伟业,雄立东方。”材料二:中华开国五千年,神州轩辕自古传。创造指南针,平
- 4化学概念在逻辑上存在如图所示关系,对下列概念间的关系说法正确的是( )A.纯净物与混合物属于包含关系B.化合物与氧化物
- 5在△ABC中,∠A=35°,∠B=45°,则∠C的度数是( )A.35°B.45°C.80°D.100°
- 6实验室制取氧气时,如使用排水法收集氧气,可按下图进行,试回答:(1)如图1进行操作,如何使瓶中装满水而不留有气泡?___
- 7解分式方程:=1。
- 8下列物质,属于纯净物的是( )A.海水B.自来水C.蒸馏水D.矿泉水
- 9下列均为呼吸系统的组成器官,其中主要的器官是( )A.鼻腔B.肺C.支气管D.气管
- 10Simon made a big bamboo box ________ the little sick bird ti
热门考点
- 1—________?—It"s my ID card.[ ]A. What"s thatB. Who is it
- 2北京奥运圣火于2008年3月25日在希腊奥林匹亚按照传统仪式取火,火炬接力时间为130天,传递总里程约13.7万公里.用
- 3阅读下面的材料,根据要求写一篇不少于800字的文章。(60分)钟子期死,伯牙破琴绝弦,终身不复鼓琴。伯牙美妙的人生遇合终
- 4(1)甲同学要把一个量程为200μA的直流电流计G,改装成量范围是0~4V的直流电压表.①她按图1所示电路、用半偏法测定
- 5下列词语中加粗字读音完全正确的一项是[ ]A.允许yǔn祈祷qǐ 处理chǔ载歌载舞zài B.粗犷kuà
- 6绿色的田径场、高大的香樟树、曲折的走廊、阳光下的石凳、热闹的操扬、安静的教室……校园里的每个角落都有一幅美丽的图画,你最
- 7Sixty percent of all Chinese are farmers and they are _____
- 8如图是甲、乙两射击运动员的10次射击训练成绩(环数)的折线统计图,观察图形,甲、乙这10次射击成绩的方差S2甲,S2乙之
- 92008年9月25日21时10分,载着翟志刚、刘伯明、景海鹏三位宇航员的“神舟七号”飞船在中国酒泉卫星发射中心发射成功,
- 10Little Jim should love___to the theatre this evening. [