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函数y=log2(x+3)-1(a>0,a≠1)的图象恒过定点A,若点A在直线m...
函数y=log
2(x+3)-1(a>0,a≠1)的图象恒过定点A,若点A在直线mx+ny+1=0上,其中mn>0,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123903233830358/SYS201310251239032338303007_ST/0.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123903233830358/SYS201310251239032338303007_ST/1.png)
的最小值为( )
A.6
B.8
C.10
D.12
考点分析:
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A.
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B.
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C.
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D.
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已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123903233830358/SYS201310251239032338303004_ST/0.png)
=(2,1),
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=10,|
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|=
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,则|
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|=( )
A.
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B.
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C.5
D.25
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2-1≤0”的否定是“∃x∈R,x
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2-1>0
I”
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D.“x=2”是“x
2=4”,的充分不必要条件
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下列说法错误的是( )
A.自变量取值一定时,因变量的取值带有一定随机性的两个变量之间的关系叫做相关关系
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123903233830358/SYS201310251239032338303002_ST/0.png)
至少经过其样本数据点(x
1,y
1),(x
2,y
2),…,(x
n,y
n)中的一个点
C.在残差图中,残差点分布的带状区域的宽度越狭窄,其模型拟合的精度越高
D.在回归分析中,R
2为0.98的模型比R
2为0.80的模型拟合的效果好
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