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【简答题】
下列函数在给定区间上是否满足拉格朗日定理的所有条件？如满足就求出定理中的数值ξ． (1)f(x)=x 3 [0，a]a＞0 (2)f(x)=lnx [1，2] (3)f(x)=x 3 -5x 2 +x-2 [-1，0]
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