设f(x)在点x=2处连续,且lim(x→2)f(x)/(X-2),求f'(2)
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咨询记录 · 回答于2022-10-09
设f(x)在点x=2处连续,且lim(x→2)f(x)/(X-2),求f'(2)
您好,设f(x)在点x=2处连续,且lim(x→2)f(x)/(X-2),求f'(2)答案是2 。,lim(x→2)(x)/(x-2)=2分子应该是f(x)还能解,因为分母趋向于0,分子必须是分母的同阶无穷小,若是lim(x→2)f(x)/(x-2)=2,说明当x->2时f(x)=0f'(2)=lim(x->2)(f(x)-f(2))/(x-2)=lim(x→2)f(x)/(x-2)=2