已知函数f(x)=x^2-2ax+5(a>1) 1若f(x)的定义域和值域均是[1,a],求实数a的值 2若f(x)在区间(负无穷,已知函数f(x)=x^2-2ax+5(a>1) 1若f(x)的定义域和值域均是[1,a],求实数a的值 2若f(x)在区间(
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