求极限lim(x→∞)（(x-1)/(x+1)）^x

求极限 lim(x→∞)5x/(x-4) 求极限 lim(x→-∞)[(√1-x)-3] 求极限lim(x→0)sinxsin(1/x);lim(x→∞)(arctanx/x) 求极限 lim(x→∞）（x+3/x-1)x次幂 求极限：lim(x→+∞)[ln(x+1)-lnx] 求lim(x→0)x cos 1/x lim(x→∞)x^2/ (3x-1)的极限 1.4求极限lim(x→∞) (x^2+x)/ (x^4-3x^+1) 求极限lim Ln(1+x) /x > .< x→0 求极限 1,lim(x→∞）（sinx/x +100) 2,lim(x→∞）xtan1/x 3,lim(x→1）sin^ lim（1+x／2）^x+2 求极限x→∞ 求极限lim(x→∞）(sin√x+1-sin√x) 几道微积分一,求极限lim x→÷∞ x一,求极限lim x→÷∞ x＋2x／2x－3x＋1二,求极限lim x→1 x 求极限lim(x→∞)(1+1/x)(2-((x+1)/x^2)*arctanx)