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1、题目54:y=cos(x/2)的周期为( )

A、 π

B、 2π

C、 π/2

D、 4π

答案:D

高中知识复习题库
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1、题目46:关于函数y=1-x2的图像,下列说法正确的是:( )
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1、题目29:已知正项等比数列{an}中,a1=1,a3=4,则此数列前3项和为( )
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1、题目18:集合{a,b,c}的真子集有( )
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高中知识复习题库

1、题目54:y=cos(x/2)的周期为( )

A、 π

B、 2π

C、 π/2

D、 4π

答案:D

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高中知识复习题库
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A.  a

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A.  was

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