lim{(1+x)(1+2x)(1+3x)+a}除以x=6(x趋向0）求a

lim(x->无穷大){(2^x-3^x)/2}^(1/x) lim(x->0)((2-x)/(3-x))^1/x lim(x+e^3x)^1/x lim(1-x)^(2/x) x->0 lim（x-3/x+1）^x lim趋向无穷大 1.lim x->∞ （2x/x^2+1)*cosx 2..lim x->∞{ [(x^2-x)arctanx]/x^3-x-5}3..lim x->0 （e^x-e^-x-2x)/(x-sinx) 4..lim x->0 (sinx-x)/(x^3) 5..lim x->0 (x^2*tanx)/(x-tanx) 6..lim x->0 (1+3/x)^2x 7..lim x->0 (1+2x)^(3/sinx) 8.lim x->∞ (x/1+x)^(x-3) 9..li lim(x+1)^x+1(x+3)^x+3/x^2x+4 x趋于无穷 lim(2x+3/2x+1)^(x+1) lim(2x-3/2x+1）^x+1 lim x->无限大 (1+1/2x) ^ 3x+lnx lim x-无穷 (√3x^2+1)/x+1 求极限lim(1-2/x+3/x^2)^x lim(x->2) {(3x+16)^1/2-4}/x 极限lim(x^2+2x+3)/(x-1) lim(x趋向无穷)[1-(2/x)]^3x lim x→∞(2x+1)/(3x-4) lim(x→0)2x^3-x+1 lim(1+3x)^(2/x)x趋向于零