lim(x→2）(1/x-1/2)/x-2是怎么化简成lim(x→2）(2-x)/2x(x-2)

lim 2（1+x）^1/x x→0 lim x→1 x-1/x^2-x Lim [x^2/(x^2-1)]^x (x→∞) lim(1+x/x)2x (x→∞) lim(x→0)e^x-x-1/x^2 lim(1-x)^(2/x) x->0 lim √（3-x）-√（1+x）/x平方+x-2x→1 lim(x→∞)e^x/[(1+1/x)^x^2]求极限,lim(x→∞)e^x/[(1+1/x)^（x^2）] lim(x)lim(x→∞) [(x-1)/(x+1)]^2x 为什么 lim(x->∞) {[(-2)/(x+1)]*2x} = -4 lim(x→0)ln（x^2+1）等于 x/2-1lim(1-2/x)x→∞ lim(x→0)(1-2x)^1/x 极限? lim(x→∞)(1-2/x) (x+1)次方 lim(x→1) (1-x)tan(π/2)x lim(x→∞)[1+(1/x)]^x/2 lim(x→∞)(1-2/x)^2x 极限lim(x→0)(1-2/x)^x lim x→∞(2x+1)/(3x-4)