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张家界国际乡村音乐周活动中,来自中、日、美的三名音乐家准备在同一节目中依次演奏本...
张家界国际乡村音乐周活动中,来自中、日、美的三名音乐家准备在同一节目中依次演奏本国的民族音乐,若他们出场先后的机会是均等的,则按“美-日-中”顺序演奏的概率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164825771401840/SYS201310221648257714018005_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164825771401840/SYS201310221648257714018005_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164825771401840/SYS201310221648257714018005_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164825771401840/SYS201310221648257714018005_ST/3.png)
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有意义的x的取值范围是( )
A.x≥
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B.x≤
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D.x≠
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某反比例函数的图象经过点(-2,3),则此函数图象也经过点( )
A.(2,-3)
B.(-3,-3)
C.(2,3)
D.(-4,6)
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方程x
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A.1-
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B.
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D.
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A.
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B.
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D.
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计算(-1)
2+(-1)
3=( )
A.-2
B.-1
C.0
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