f'(e^x)=1+x
令e^x=t
x=lnt
所以
f'(t)=1+lnt
所以
∫f'(t)dt=∫(1,t)(1+lnt)dt
f(t)=t+tlnt-t+c
所以
f(x)=xlnx+c
∫(a,b)f'(2x)dx
=1/2∫(a,b)f'(2x)d2x
=1/2*f(2x)|(a,b)
=1/2*[f(2b)-f(2a)]
=1/2[2bln2b-2aln2a]
=bln2b-aln2a
若f'(e^x)=1+x,則f(x)等于什么?∫(a,b)f'(2x)dx等于 什么?
若f'(e^x)=1+x,則f(x)等于什么?∫(a,b)f'(2x)dx等于 什么?
其他人氣:223 ℃時(shí)間:2020-06-02 10:47:52
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