求极限lim(x->1)(√(x^2+3x)-2)/(1-x^2)

求极限lim(1-2/x+3/x^2)^x x趋向无穷大时求lim√(x^2-3x+1)/x极限 求极限lim(x-->0)x^2 sin(1/x), 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 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) 求极限lim{xln(1+2/x)} 极限lim(x^2+2x+3)/(x-1) 极限：lim(x->2)1/(x-2) 求下列极限：1)lim√(x)lnx (x->0+); 2)lim(sinx/x)^1/x (x->0+) 求极限 （（sin(x^3+x^2-x)+sin x) /x x→0 已知lim sinx/x=1