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如图,一次函数y=kx+b的图象经过A、B两点,则kx+b>0解集是( ) A....
如图,一次函数y=kx+b的图象经过A、B两点,则kx+b>0解集是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161015969009177/SYS201310221610159690091008_ST/images0.png)
A.x>0
B.-3<x<2
C.x>2
D.x>-3
考点分析:
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A.6(
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B.6(
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C.12(
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161015969009177/SYS201310221610159690091007_ST/2.png)
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关于函数
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161015969009177/SYS201310221610159690091006_ST/0.png)
,下列结论正确的是( )
A.函数图象必经过点(1,2)
B.函数图象经过第二、四象限
C.y随x的增大而增大
D.不论x取何值,总有y>0
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晓晓根据下表,作了三个推测:
x | 1 | 10 | 100 | 1000 | 10000 | … |
3-![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161015969009177/SYS201310221610159690091005_ST/0.png) | 3 | 2.1 | 2.01 | 2.001 | 2.0001 | … |
①3-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161015969009177/SYS201310221610159690091005_ST/1.png)
(x>0)的值随着x的增大越来越小;
②3-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161015969009177/SYS201310221610159690091005_ST/2.png)
(x>0)的值有可能等于2;
③3-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161015969009177/SYS201310221610159690091005_ST/3.png)
(x>0)的值随着x的增大越来越接近于2.
则推测正确的有( )
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B.1个
C.2个
D.3个
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A.60°
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