∫x+1/(x2+3x+5)dx=1/2∫（2x+3）/((x+3/2)^2+11/4)dx-1/2∫1/((x+3/2)^2+11/4)dx=1/2∫1/((x+3/2)^2+11/4)d((x+3/2)^2)-2/11∫1/((2√11x/11+3√11/11)^2+1)d(x+2/3)=1/2ln(x^2+3x+5)-2/11arctan(2√11x/11+3√11...