已知函数
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(I)当0<a<b,且f(a)=f(b)时,求
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的值;
(II)是否存在实数a,b(a<b),使得函数y=f(x)的定义域、值域都是[a,b],若存在,则求出a,b的值,若不存在,请说明理由.
考点分析:
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