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如果偶函数f(x)在[3,7]上是增函数且最小值是2,那么f(x)在[-7,-3...
如果偶函数f(x)在[3,7]上是增函数且最小值是2,那么f(x)在[-7,-3]上是( )
A.减函数且最小值是2
B..减函数且最大值是2
C.增函数且最小值是2
D.增函数且最大值是2
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n和b
n满足:a
1=λ,
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n-3n+21),其中λ为实数,n为正整数.
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n的通项公式;
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n为数列b
n的前n项和,如果对于任意正整数n,总存在实数λ,使得不等式a<S
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