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对 f(x) = 1/x ，计算 [1, 1+h] 上的 TVM 并简化。当 h -> 0 时发生什么？
对 f(x) = 1/x ，计算 [1, 1+h] 上的 TVM 并简化。当 h -> 0 时发生什么？
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