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我们可以把一个函数记作y=f(x),若已知f(3x)=3x2+b,且f(1)=0...
我们可以把一个函数记作y=f(x),若已知f(3x)=3x
2+b,且f(1)=0,则( )
A.
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B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818766435805/SYS201310221648187664358007_ST/1.png)
C.f(x)=3x
2-3
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818766435805/SYS201310221648187664358007_ST/2.png)
考点分析:
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若y
1=bx和
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没有交点,则下列a,b的可能取值中,成立的是( )
A.a=1,b=1
B.a=-1,b=1
C.a=2,b=2
D.a=-2,b=-2
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如图所示,在半径
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的圆中∠C=30°,则AB的值为( )
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A.
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B.
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C.
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D.
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C.
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D.
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如图所示,B是AC的中点,AD∥EC,则AD:EC的值是( )
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A.3:1
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一次函数y=-3x+b与坐标轴围成的面积是6,且b≥0,则b的值是( )
A.3
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818766435805/SYS201310221648187664358002_ST/0.png)
C.6
D.9
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