由已知,当x→a时lim f(x)/(x-a)^n = s s不为0lim g(x)/(x-a)^m = t t不为0所以lim (f(x)+g(x))/(x-a)^n =lim f(x)/(x-a)^n + lim g(x)/(x-a)^n=s + lim g(x)/(x-a)^m * (x-a)^m/(x-a)^n=s +lim g(x)/(x-a)^m * lim(x...