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若f(x)=ax2+bx+3a-b是偶函数,且定义域为[a-1,-2a],则a=...
若f(x)=ax2+bx+3a-b是偶函数,且定义域为[a-1,-2a],则a= b= .
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的最小值是( )
A.3
B.-3
C.
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与极轴所在直线垂直的直线方程是( )
A.ρcosθ=-2
B.ρcosθ=2
C.
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,则抛物线y
2=-4x在这个变换下所得到的曲线的方程是( )
A.y
2=4
B.y
2=
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已知f(x)为奇函数,且f(x)=log
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A.
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D.
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