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设f(x)和g(x)是定义在同一区间[a,b]上的两个函数,若对任意的x∈[a,...
设f(x)和g(x)是定义在同一区间[a,b]上的两个函数,若对任意的x∈[a,b],都有|f(x)-g(x)|≤1,则称f(x)和g(x)在[a,b]上是“密切函数”,[a,b]称为“密切区间”,设f(x)=x2-3x+4与g(x)=2x-3在[a,b]上是“密切函数”,则它的“密切区间”可以是( )
A.[1,4]
B.[2,3]
C.[3,4]
D.[2,4]
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A.[3,5]
B.[-1,1]
C.[-1,3]
D.
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