二次函数y=(x-1)2+2的最小值是 .
考点分析:
相关试题推荐
如果一个一次函数的图象经过第一、二、四象限,那么这个一次函数的解析式可以是
(只要求写一个符合要求的一次函数解析式).
查看答案
如果
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161823538802363/SYS201310221618235388023010_ST/0.png)
是整数,则正整数n的最小值是
.
查看答案
如图,在矩形ABCD中,P是CD边上一点,PE⊥BD,垂足为E,PF⊥AC,垂足为F,如果AB=4,AD=3,那么PE+PF等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161823538802363/SYS201310221618235388023009_ST/images0.png)
A.3
B.4
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161823538802363/SYS201310221618235388023009_ST/0.png)
D.
查看答案
如图,∠AOB=60°,过OA上到点O的距离分别为1,2,3,4,5,…的点作OA的垂线与OB相交,得到一组梯形,它们的面积分别为S
1,S
2,S
3,S
4,S
5,….观察图中的规律,可知第20个梯形的面积S
20等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161823538802363/SYS201310221618235388023008_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161823538802363/SYS201310221618235388023008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161823538802363/SYS201310221618235388023008_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161823538802363/SYS201310221618235388023008_ST/2.png)
D.
查看答案
设实数a=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161823538802363/SYS201310221618235388023007_ST/0.png)
,则a值的范围是( )
A.1<a≤
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161823538802363/SYS201310221618235388023007_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161823538802363/SYS201310221618235388023007_ST/2.png)
<a≤3
C.3<a≤3
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161823538802363/SYS201310221618235388023007_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161823538802363/SYS201310221618235388023007_ST/4.png)
<a<4
查看答案