如题所述
∫x^3/(1 x^2)dx
=∫(x^3 x-x)/(1 x^2)dx
=∫(x^3 x)/(1 x^2)dx-∫x/(1 x^2)dx
=∫xdx-(1/2)∫2x/(1 x^2)dx
=x^2/2-(1/2)ln(1 x^2)