∫(x^3+1)/(x^2+1)^2dx

∫x^3/1+x^2 dx ∫(x-1)^2/x^3 dx ∫(X^3)/(1+X^2)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 ∫(x^3-x^2+x+1)/(x^2+1) dx∫(x+4)/(x^2-x-2) dx ∫[dx/(e^x(1+e^2x)]dx ∫1+2x/x(1+x)*dx∫1+2x/x(1+x) * dx ∫(x-1)^2dx, ∫x^1/2dx ∫(3x^4+x^2)/(x^2+1)dx ∫(e^x+3x^2+(2/x)-1)dx ∫x/(3+4x+x^2)^1/2dx ∫(3x+2)/(x(x+1)^3)dx ∫(3x+2)/x(x+1)^3 dx ∫（x^3 -x)(3x^2-1)dx 求不定积分∫(x^2-3x)/(x+1)dx 1/(x+x^2)dx