lim下面x→2(3x^2-2x+4) lim下面x→3 x-3/x^2-9 lim下面x→∞ 3x^2-2x+2/5x

求lim(x→0)x cos 1/x lim(x→∞)x^2/ (3x-1)的极限 计算极限lim(lim下面是x→2)x^2-4/x^2-6x+8 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 求极限lim(x→2)(x^2-3x+2)/(x^2+4x-12) lim(x->0)((2-x)/(3-x))^1/x 求极限：1.lim(x→∞) (3x^2 -2)/(x^4 +x^2 -1) 2.lim(x→∞) (4x^4 -2x^ lim 3x^2-3x+2／x^2-4 求极限x→∞ 求极限lim(x→∞)[(2x+5)/(2x+3)]^(x+1) lim(x→∞)（根号4x²-3x+2）/2x等于多少? lim.2x³-x²+9 ------ x→∞ 3x³+1 设lim（x→0）[f(x)-3]/x^2=100,求lim(x→0)f(x)