∫x/(x^3+1)dx
将x替换
x=(-1/3)(x^2-x+1)+(1/3)(x+1)(x+1)
∫x/(x^3+1)dx=∫(-1/3)x/(x+1)dx+∫(1/3)(x+1)/(x^2-x+1)dx
=(1/3)(lnIx+1I-x)+(1/6)∫1/(x^2-x+1)d(x^2-x+1)+(√3/3)arctan[(2x-1)/√3]
=(1/3)(lnIx+1I-x)+(1/6)lnIx^2-x+1I+(√3/3)arctan[(2x-1)/√3]+C
解答完毕,真心不易,请及时采纳呀
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