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函数f(x)=3sin(2x++ϕ),ϕ∈(0,π)满足f(|x|)=f(x),...
函数f(x)=3sin(2x+
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+ϕ),ϕ∈(0,π)满足f(|x|)=f(x),则ϕ的值为( )
A.
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B.
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C.
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D.
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则该校招聘的教师人数最多是( )
A.6
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圆:x
2+y
2-2x-2y+1=0上的点到直线x-y=2的距离最大值是( )
A.2
B.
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C.
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D.
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按照程序框图(如右图)执行,第3个输出的数是( )
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A.7
B.6
C.5
D.4
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=( )
A.π
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已知i为虚数单位,若复数z
1=1-i,z
2=2+i,则z
1•z
2=( )
A.3-i
B.2-2i
C.1+i
D.2+2i
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