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如图,在矩形区域ABCD的A,C两点处各有一个通信基站,假设其信号覆盖范围分别是...
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如图,在矩形区域ABCD的A,C两点处各有一个通信基站,假设其信号覆盖范围分别是扇形区域ADE和扇形区域CBF(该矩形区域内无其他信号来源,基站工作正常).若在该矩形区域内随机地选一地点,则该地点无信号的概率是( )
A.
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B.
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C.
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D.
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某单位有840名职工,现采用系统抽样方法,抽取42人做问卷调查,将840人按1,2,…,840随机编号,则抽取的42人中,编号落入区间[481,720]的人数为( )
A.11
B.12
C.13
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设
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,
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为向量,则|
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•
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|=|
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||
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|是“
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∥
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”的( )
A.充分不必要条件
B.必要不充分条件
C.充分必要条件
D.既不充分也不必要条件
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根据下列算法语句,当输入x为60时,输出y的值为( )
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A.25
B.30
C.31
D.61
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设全集为R,函数
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的定义域为M,则∁
RM为( )
A.[-1,1]
B.(-1,1)
C.(-∞,-1]∪[1,+∞)
D.(-∞,-1)∪(1,+∞)
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设n是正整数,r为正有理数.
(Ⅰ)求函数f(x)=(1+x)
r+1-(r+1)x-1(x>-1)的最小值;
(Ⅱ)证明:
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;
(Ⅲ)设x∈R,记[x]为不小于x的最小整数,例如
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.令
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的值.
(参考数据:
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.
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