一组数据11,8,-1,9,12的极差是 .
考点分析:
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如图是一个高为
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cm,底面半径为2cm的圆锥形无底纸帽,现利用这个纸帽的侧面纸张裁剪出一个圆形纸片(不考虑纸帽接缝),这个圆形纸片的半径最长可以是( )
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A.4cm
B.(
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)cm
C.
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cm
D.(
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)cm
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由图所示的地板砖各两块所铺成的下列图案中,既是轴对称图形,又是中心对称图形的是( )
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A.
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B.
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C.
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D.
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木盒里有1个红球和1个黑球,这两个球除颜色外其他都相同,从盒子里先摸出一个球,放回去摇匀后,再摸出一个球,两次都摸到红球的概率是( )
A.
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B.
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C.
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D.
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函数y=
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的自变量x的取值范围为( )
A.x≥0
B.x>0
C.x≠0
D.x为一切实数
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下列运算正确的是( )
A.a
2•a
3=a
6B.(
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)
-1=-2
C.
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=±4
D.|-6|=6
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