求极值x→∞ lim(3+x)/(x+2)^ 2x

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) lim 3x^2-3x+2／x^2-4 求极限x→∞ 求极限lim(x→∞)(2x/3-x)-(2/3x) 求极限lim(x→∞)[(2x+5)/(2x+3)]^(x+1) 求极限 lim [(3+x)/(6+x)]^[(x-1)/2]= x→∞ lim (x+2/x-3)^x 求函数极限 (x→∞) 求极限：1.lim(x→∞) (3x^2 -2)/(x^4 +x^2 -1) 2.lim(x→∞) (4x^4 -2x^ 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 1,lim(x→∞）（sinx/x +100) 2,lim(x→∞）xtan1/x 3,lim(x→1）sin^ 求极限lim(x→2)(x^2-3x+2)/(x^2+4x-12) 求lim(x^2+2x)/(x^3-3x+2),x→无穷的极限