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【简答题】
已知函数f(x)＝ (m，n∈R)在x=1处取得极大值2． （1）求函数f（x）的解析式； （2）求函数f（x）的极值； （3）设函数g（x）=x 2 -2ax+a，若对于任意x 2 ∈[-1，1]，总存在x 1 ∈R，使得g（x 2 ）≤f（x 1 ），求实数a的取值范围．
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