高数不定积分计算
2个回答
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(1)
∫x.e^(-x) dx
=-∫xde^(-x)
=-x.e^(-x) +∫e^(-x) dx
=-x.e^(-x) -e^(-x) +C
(2)
∫xlnx dx
=(1/2) ∫lnx dx^2
=(1/2)x^2.lnx -(1/2) ∫x dx
=(1/2)x^2.lnx -(1/4)x^2 +C
(3)
∫x^2 arctanx dx
=(1/3)∫arctanx dx^3
=(1/3)x^3.arctanx -(1/3)∫x^3/(1+x^2) dx
=(1/3)x^3.arctanx -(1/3)∫[x - x/(1+x^2)] dx
=(1/3)x^3.arctanx -(1/6)x^2 + (1/6)ln|1+x^2| + C
∫x.e^(-x) dx
=-∫xde^(-x)
=-x.e^(-x) +∫e^(-x) dx
=-x.e^(-x) -e^(-x) +C
(2)
∫xlnx dx
=(1/2) ∫lnx dx^2
=(1/2)x^2.lnx -(1/2) ∫x dx
=(1/2)x^2.lnx -(1/4)x^2 +C
(3)
∫x^2 arctanx dx
=(1/3)∫arctanx dx^3
=(1/3)x^3.arctanx -(1/3)∫x^3/(1+x^2) dx
=(1/3)x^3.arctanx -(1/3)∫[x - x/(1+x^2)] dx
=(1/3)x^3.arctanx -(1/6)x^2 + (1/6)ln|1+x^2| + C
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