lim (x→∞)(4+3x)^2/x(1-x^2)

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 求lim(x→0)x cos 1/x lim(x→∞)x^2/ (3x-1)的极限 求极限：1.lim(x→∞) (3x^2 -2)/(x^4 +x^2 -1) 2.lim(x→∞) (4x^4 -2x^ 几道求极限的高数题,lim1/x(tanπx/(2x+1)) x→∞lim x(x^x-1)x→0+lim(x^x^x- lim(x→∞)[(a x^2)/x+1]+bx=lim(x→∞)(a x^2)+bx(x+1) / x+1=lim(x lim(x→∞)[sinx/x+xsin(1/2x)] lim(x->2) {(3x+16)^1/2-4}/x lim(x->0)((2-x)/(3-x))^1/x lim 3x^2-3x+2／x^2-4 求极限x→∞ lim(x→∞)（根号4x²-3x+2）/2x等于多少? 求极限lim(x→∞)[(2x+5)/(2x+3)]^(x+1)