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已知y=f(x)是偶函数,当x>0时,f(x)=x+,且当x∈[-3,-1]时,...
已知y=f(x)是偶函数,当x>0时,f(x)=x+
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,且当x∈[-3,-1]时,m≤f(x)≤n成立,则n-m的最小值为( )
A.
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B.
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C.
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D.1
考点分析:
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