52、设alog4=2,则4-a=()
A. 1/16
B. 1/8
C. 1/6
D. 1/9
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100、
A. a 16
B. a 8
C. a 2
D. a 4
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172、
A. 2/1
B. 3/1
C. 5/1
D. 4/1
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483、
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1的概率是()
A. π/4
B. 2-π/8
C. 1-π/4
D. π/8
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25、计算2³的值为()
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492、先后抛掷硬币三次,则至少一次正面朝上的概率是
A. 5/8
B. 3/8
C. 1/8
D. 7/8
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316、已知全集 U ={1,2,3,4,5},A={1,2, 6}, B={2,4,5},则(A∩B=()
A. .{3,4,5}
B. .{1,2,3,4,5,6}
C. .{2,4,5}
D. .{4,5}
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362、过点(10)且与直线x-2y-2=0垂直的直线方程是( )
A. 2x+y-2=0
B. x+2y-1=0
C. x-2y-1=0
D. x-2y+1=0
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397、已双曲线C: r²/a²=1(a>0²,ab>0,b-的心中为、5,则点((0)到C的近的更离为()
A. 2
B. 2.2
C. 3√2/2
D. √2
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