当x= 时,二次函数y=x2+2x-2有最小值.
考点分析:
相关试题推荐
如图,在平面直角坐标系xOy中,点A的坐标为(
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193603170067999/SYS201311011936031700679009_ST/0.png)
,1),点B是x轴上的一动点,以AB为边作等边三角形ABC、当C(x,y)在第一象限内时,下列图象中,可以表示y与x的函数关系的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193603170067999/SYS201311011936031700679009_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193603170067999/SYS201311011936031700679009_ST/images2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193603170067999/SYS201311011936031700679009_ST/images3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193603170067999/SYS201311011936031700679009_ST/images4.png)
D.
查看答案
如图,依次连接第一个矩形各边的中点得到一个菱形,再依次连接菱形各边的中点得到第二个矩形,按照此方法继续下去.已知第一个矩形的面积为1,则第n个矩形的面积为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193603170067999/SYS201311011936031700679008_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193603170067999/SYS201311011936031700679008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193603170067999/SYS201311011936031700679008_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193603170067999/SYS201311011936031700679008_ST/2.png)
D.
查看答案
如图,已知菱形ABCD的对角线AC、BD的长分别为6cm、8cm,AE⊥BC于点E,则AE的长是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193603170067999/SYS201311011936031700679007_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193603170067999/SYS201311011936031700679007_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193603170067999/SYS201311011936031700679007_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193603170067999/SYS201311011936031700679007_ST/2.png)
D.
查看答案