F(x)=∫(a,x)tf(t)dt,则F'(x)=
F(x)=∫(a,x)tf(t)dt,则F'(x)=
数学人气:819 ℃时间:2019-12-08 23:32:52
优质解答
则F'(x)=xf(x)但是答案是(x-a)[f(x)-f(a)],这是积分限函数求导,等于被积函数,将积分变量换成积分上限变量。xf(x)
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