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数学
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已知f(0)=0,f'(0)=1,求极限limf(2x)/x (x趋于0).
人气:148 ℃ 时间:2019-08-21 01:08:36
解答
lim(x->0)f(2x)/x
=2 lim(2x->0)[f(2x)-f(0)/2x]
= 2f'(0)
=2
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