Lim=(3x-x^2)/x-3; x->3
lim ( (3x^3 - 5x^2 +2)/(2x^3+5x^2-x) ) =Lim((x3*(3-5/x+2/x^3))/((x^3*(2+5/x-1/x^2))=Lim(3-0+0)/(2+0-0)=1,5.