高等数学题。只做第二题划线的。求解啊,
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2、(1) ∫(2/x+x/3)^2dx
=∫(4/x^2+x^2/9+4/3)dx
=-4/x+1/27x^3+4/3x+C
(2) ∫1/(x^2√x)dx
=2∫1/(√x)^4d√x
=-2/3x^(-3/2)+C
(5) ∫e^(x-3)dx
=∫e^(x-3)d(x-3)
=e^(x-3)+C
(6) ∫x^2/(1+x^2)dx
=∫[(1+x^2)-1]/(1+x^2)dx
=∫[1-1/(1+x^2)]dx
=x-arctanx+C
=∫(4/x^2+x^2/9+4/3)dx
=-4/x+1/27x^3+4/3x+C
(2) ∫1/(x^2√x)dx
=2∫1/(√x)^4d√x
=-2/3x^(-3/2)+C
(5) ∫e^(x-3)dx
=∫e^(x-3)d(x-3)
=e^(x-3)+C
(6) ∫x^2/(1+x^2)dx
=∫[(1+x^2)-1]/(1+x^2)dx
=∫[1-1/(1+x^2)]dx
=x-arctanx+C
追问
辛苦了,谢谢
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