将一枚硬币连掷四次,其中仅连续两次出现正面向上的概率是 .
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线段AB在平面α内,线段AC垂直于平面α,线段BD垂直于AB,线段DD'垂直于平面α,AB=3,AC=BD=4,CD=5,则BD与平面α所成的角为
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若数列{a
n}满足a
1=15,
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,则该数列的通项公式是
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设x∈R,记不超过x的最大整数为[x],令{x}=x-[x],则{
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( )
A.是等差数列但不是等比数列
B.是等比数列但不是等差数列
C.既是等差数列又是等比数列
D.既不是等差数列也不是等比数列
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双曲线
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的渐近线方程是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231349780890308/SYS201311012313497808903006_ST/1.png)
B.
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C.
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D.
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