1)∫((x+3)/x^3*dx=∫x^(-2)dx+3∫x^(-3)dx=-x^(-1)-3/2x^(-2)+C=-1/x-3/2x^2+C=-(2x+3)/2x^2+C
∫2,1((x+3)/x^3*dx=|2,1(-(2x+3)/2x^2)=-(2*2+3)/(2*2^2)+(2+3)/2=-7/8+5/2=(-7+20)/8=13/8
2) ∫3,2dx/(3x-1)=|3,2(ln(3x-1)/3)=ln(3*3-1)/3-ln(3*2-1)/3=ln(8)/3-ln(5)/3=ln(2/5)