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已知:M,N两点关于y轴对称,且点M在双曲线上,点N在直线y=x+3上,设点M的...
已知:M,N两点关于y轴对称,且点M在双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185356464910825/SYS201311011853564649108008_ST/0.png)
上,点N在直线y=x+3上,设点M的坐标为(a,b),则二次函数y=-abx
2+(a+b)x( )
A.有最大值,最大值为
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185356464910825/SYS201311011853564649108008_ST/1.png)
B.有最大值,最大值为
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185356464910825/SYS201311011853564649108008_ST/2.png)
C.有最小值,最小值为
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185356464910825/SYS201311011853564649108008_ST/3.png)
D.有最小值,最小值为
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185356464910825/SYS201311011853564649108008_ST/4.png)
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