已知f(x)是偶函数,且f(x)在[0,+∞)上是增函数;若不等式f (ax + 1)≤f (x –2)对x∈[,1]恒成立,则实数a的取值范围是
A.[–5,0] | B.[–2,0] | C.[–5,1] | D.[–2,1] |
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已知f(x)是偶函数,且f(x)在[0,+∞)上是增函数;若不等式f (ax + 1)≤f (x –2)对x∈[,1]恒成立,则实数a的取值范围是
A.[–5,0] | B.[–2,0] | C.[–5,1] | D.[–2,1] |
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