满分5 >
初中数学试题 >
(2006•日照)已知M,N两点关于y轴对称,且点M在反比例函数的图象上,点N在...
(2006•日照)已知M,N两点关于y轴对称,且点M在反比例函数
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021231858083805877/SYS201310212318580838058017_ST/0.png)
的图象上,点N在一次函数y=x+3的图象上,设点M的坐标为(a,b),则二次函数y=abx
2+(a+b)x( )
A.有最小值,且最小值是
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021231858083805877/SYS201310212318580838058017_ST/1.png)
B.有最大值,且最大值是-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021231858083805877/SYS201310212318580838058017_ST/2.png)
C.有最大值,且最大值是
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021231858083805877/SYS201310212318580838058017_ST/3.png)
D.有最小值,且最小值是-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021231858083805877/SYS201310212318580838058017_ST/4.png)
考点分析:
相关试题推荐
(2006•凉山州)已知函数y=ax
2+bx+c的图象如左下图所示,则函数y=ax+b的图象可能是右下图中的( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021231858083805877/SYS201310212318580838058016_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021231858083805877/SYS201310212318580838058016_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021231858083805877/SYS201310212318580838058016_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021231858083805877/SYS201310212318580838058016_ST/images3.png)
D.
查看答案
(2006•烟台)直线y=ax+b经过第二、三、四象限,那么下列结论正确的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021231858083805877/SYS201310212318580838058015_ST/0.png)
=a+b
B.点(a,b)在第一象限内
C.反比例函数
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021231858083805877/SYS201310212318580838058015_ST/1.png)
,当x>0时,函数值y随x增大而减小
D.抛物线y=ax
2+bx+c的对称轴过二、三象限
查看答案
(2006•黔东南州)下列函数中,当x>0时,y随x的增大而增大的函数是( )
A.y=-x
2+2
B.y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021231858083805877/SYS201310212318580838058014_ST/0.png)
C.y=-3
D.y=2x+1
查看答案
(2006•烟台)下列四个函数中,y随x增大而减小的是( )
A.y=2
B.y=-2x+5
C.y=-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021231858083805877/SYS201310212318580838058013_ST/0.png)
D.y=-x
2+2x-1
查看答案
(2006•黄石)已知二次函数y=ax
2+bx有最大值,且图象顶点在y轴的右侧,则函数y=ax+b与y=ax
2+bx的图象大致是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021231858083805877/SYS201310212318580838058012_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021231858083805877/SYS201310212318580838058012_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021231858083805877/SYS201310212318580838058012_ST/images2.png)
D.
查看答案