∫［3/(x^3+1)］dx

求不定积分∫［3/(x^3+1)］dx ∫［3/(x^3+1)］dx ∫dx/［1+（2x+3）］ ∫1/x(1+x^3)dx ∫x+1／(x-1)^3dx 求∫x/(1+x)^3 dx ∫ x/ (1+x)^3 dx ∫dx/x(x^3+1) ∫x^3/1+x^2 dx ∫(x-1)^2/x^3 dx ∫(X^3)/(1+X^2)dx ∫1/（x^3+x） dx x-9/[(根号)x]+3 dx ∫ x+1/[(根号)x] dx ∫ [（3-x^2）]^2 dx ∫x^3/(x^8-2) dx∫(x^3-1)/(x^2+1) dx ∫1/(x^100+x)dx ∫1/(e^x+e^3x)dx ∫(1/(1+(根号3x))dx ∫1/（x^3+1）dx ∫(arctanx)^3/(1+x^2)dx