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若a,b,c成等比数列,则函数f(x)=ax2+bx+c的图象与x轴的交点个数是...
若a,b,c成等比数列,则函数f(x)=ax2+bx+c的图象与x轴的交点个数是 .
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函数y=f(2x-1)是偶函数,则函数y=f(2x)的对称轴是( )
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已知向量
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=(cosθ,sinθ),向量
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=(
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,-1)则|2
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-
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|的最大值,最小值分别是( )
A.4
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B.4,4
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C.16,0
D.4,0
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