lim(x→∞)4x＾4+3x＾2+2/8x＾4+2 就极限?

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 lim 3x^2-3x+2／x^2-4 求极限x→∞ 求极限lim(x→2)(x^2-3x+2)/(x^2+4x-12) 求极限：1.lim(x→∞) (3x^2 -2)/(x^4 +x^2 -1) 2.lim(x→∞) (4x^4 -2x^ 求极限lim(x→∞)2x^2-x/x^2+4 求极限lim（x→∞)(3x^2+x+2)/(4x^3+2x+3) lim(x→0)[（3x+1)/(4x-2)]^1/x 这道题怎么算极限 求极限：lim(x->4)(x^2-6x+8)/(x^2-5x+4) 求极限lim (3x^3+5x^2+x) / (7x^3+5x-4) lim[(4x^3-2x^2+x)/(3x^3+2x)] x→0,求极限. 计算极限lim(lim下面是x→2)x^2-4/x^2-6x+8