lim→1 （X^2-3X+2)/(X^2+4X-5) 求极限

lim x→∞(2x+1)/(3x-4) lim(x→0)2x^3-x+1 求lim(x→0)x cos 1/x lim(x→∞)x^2/ (3x-1)的极限 lim(x→1)(x^3-3x+2)/(x^3-x^2-x+1) lim(x→1)[(x^(3x-2)-x)sin2(x-1)]/(x-1)^3 lim((√1+x^2)+x)/((√x^3+x)-x)x→+无穷大 Lim [x^2/(x^2-1)]^x (x→∞) lim x→1 x-1/x^2-x lim(1+x/x)2x (x→∞) lim(x→0)e^x-x-1/x^2 lim(x->无穷大){(2^x-3^x)/2}^(1/x) lim(x->0)((2-x)/(3-x))^1/x lim(1-x)^(2/x) x->0 1.lim x→0 3x/(sinx-x)2.lim x→0 (1-cosmx)/x^23.lim x→0 sin4x/[(√x+2)-√2]4.lim h →0 [sin(x+h)-sin(x-h)]/h lim(x→∞)(4x^3+2x-1)/(2x^3-3x+1) lim(x→∞)(2x^3-x^2-3)/(x^3-x+1) lim x→0 (x^2+2x-1)/(x^3-2x)的极限是多少 lim(x→∞)[(X^2+2x+5)/(3x^2-x+1) =