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使分式有意义的x的取值范围是( ) A.x≥ B.x≤ C.x> D.x≠
使分式
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有意义的x的取值范围是( )
A.x≥
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164825770685897/SYS201310221648257706858004_ST/1.png)
B.x≤
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164825770685897/SYS201310221648257706858004_ST/2.png)
C.x>
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164825770685897/SYS201310221648257706858004_ST/3.png)
D.x≠
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164825770685897/SYS201310221648257706858004_ST/4.png)
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方程x
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A.1-
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B.
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![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164825770685897/SYS201310221648257706858002_ST/2.png)
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下列各图是选自历届世博会徽中的图案,其中是中心对称图形的是( )
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![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164825770685897/SYS201310221648257706858001_ST/images1.png)
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计算(-1)
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(1)请利用学过的数学知识作出y
1=3
x的大致图象;
(2)请证明y
1和y
2=x
2只有一个负根;
(3)设y
3=ax+1与y
2交于A,B两点,那么是否存在这样的a,使得AOB为直角三角形,请在计算后给予说明.
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