求lim(2x^3-x+1)

求极限lim(1-2/x+3/x^2)^x 求lim(x→0)x cos 1/x lim(x→∞)x^2/ (3x-1)的极限 求极限lim(1+2/x)^2x+3 求lim√(3-x)-√(1+x)/(x^2+x-2) (x->1) 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 x→π/2 (sin2x)^3 lim x→0 根号(1+x^2)-1/x 求极限 1,lim(x→∞）（sinx/x +100) 2,lim(x→∞）xtan1/x 3,lim(x→1）sin^ 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-->0)x^2 sin(1/x), 求极限 （（sin(x^3+x^2-x)+sin x) /x x→0 已知lim sinx/x=1 求极限,分母为零.lim x to -1 (x^2-4x)/(x^2-3x-4)lim x to 1 (x^3-1)/(