（x^2-x-2)/(x+1) x趋向于2 的极限,x+1在上面

lim(1-2x)^1/x x趋向于0 lim(x趋向于0)(x*cotx-1)/(x^2) x趋向于0,求ln(1+2x)/x lim(1+3x)^(2/x)x趋向于零 f(x)={x x=1}求lim x趋向于1- f(x) lim x趋向于1+ f(x) lim趋向于1 f(x)f(x)={2x-1 x0} 求lim x趋向于0- f(x) lim x趋向于0+ f(x) lim趋向于0 f(x) （x^2-x-2)/(x+1) x趋向于2 的极限,x+1在上面 求极限,lim(x趋向于1)(x^2-2x+1)/(x^3-x) (x^3+2x-3)/(x^2+5x-6) x趋向于1的极限 lim((1+x)^5-(1+5x))/(x^2+x^5) x趋向于0 lim (1+x)^5+(1+5x)/(x^2+x^5) x趋向于0 (1-x)tan(πx/2),lim 趋向于1, lim（x趋向于0）（1-cosx)/x^2 求lim x趋向于0(arctanx)/(x^2+1) lime^x-1 /2 x趋向于0,求极限 lim f(x)=A x趋向于a limf(x^2)=A x趋向于a^2/1 计算limx^2y/x^2+y^2,x趋向于0.y趋向于1~ x^2sin1/x^2 极限X趋向于0 lim[(sin x)^tan x],x趋向于Pai/2