极限lim(x^2+2x+3)/(x-1)

极限lim(x^2+2x+3)/(x-1) 求极限lim(1-2/x+3/x^2)^x 极限：lim(x->2)1/(x-2) 求极限lim(1+2/x)^2x+3 求lim(x→0)x cos 1/x lim(x→∞)x^2/ (3x-1)的极限 lim x→0 (x^2+2x-1)/(x^3-2x)的极限是多少 lim（x^2-2x+1）/（x^3-x）的极限,x趋于1 lim(x+5)(2x-1)/(x^2-3x-1)球极限,x无穷大 求极限lim(x~0)((e^x+e^2x+e^3x)/3)^1/x 1.4求极限lim(x→∞) (x^2+x)/ (x^4-3x^+1) lim(x→∞)(x^2+x)/(x^4-3x-1)的极限 极限lim(x→0)(1-2/x)^x