一道AP微积分题目If f is differentiable and difference quotients ove

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一道AP微积分题目
If f is differentiable and difference quotients overestimate the slope of f at x=a for all h>0, which must be true?
Answer: f''(a)>0 为什么= =
我知道了……但是回答仍然给分！

二阶导大于0,保证了一阶导存在且递增,在x=a处一阶导已知,据此可知

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