如果可以请采纳
x^2= x(1+x) -x= x(1+x) -(1+x) +1lim(x->∞) [ x^2/(1+x) -ax-b] =1lim(x->∞) [ x-1 +1/(1+x) -ax-b] =1lim(x->∞) [ (1-a)x+ (-1-b) +1/(1+x) ] =1=>1-a=0 and -1-b=1a=1 and b=-2(a,b) =(1,-2)
