lim(x->∞) (x-1)(x-2)(x-3)/(1-4x)^3=lim(x->∞) (1-1/x)(1-2/x)(1-3/x)/(1/x-4)^3=(1*1*1)/(-4)^3=-1/64lim(x->∞) [2x/(3-x)-2/(3x^2)]=lim(x->∞) [2/(3/x-1)-2/(3x^2)]=2/(-1)-0=-2
