作业帮已知f(x)在a点可导,则极限 lim (t趋向于0）[f(a-2t)-f(a)]\(-2t)=?
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已知f(x)在a点可导,则极限 lim (t趋向于0）[f(a-2t)-f(a)]\(-2t)=?
已知f(x)在a点可导,则极限 lim (t趋向于0）[f(a-2t)-f(a)]\(-2t)=?
已知f(x)在a点可导,则极限 lim (t趋向于0）[f(a-2t)-f(a)]\(-2t)=?
把-2t看成Δt,那么根据导数的定义：lim (Δt趋向于0）[f(a+Δt)-f(a)]\Δt=f ‘（a）,即等于f（x）在a点的导数
lim (t趋向于0）[f(a-2t)-f(a)]\(-2t)=f'(a)