lim(1-2/x)^2x=?x趋向于无穷

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) lim(1-2x)^1/x x趋向于0 lim(x趋向于0)(x*cotx-1)/(x^2) lim(1+3x)^(2/x)x趋向于零 求lim(1+1/x) (2-x^2)趋向于无限时的极限 lim(1-2x)^(1/x)=?lim下面是X趋向于0 lim f(x)=A x趋向于a limf(x^2)=A x趋向于a^2/1 (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) lim(x^2+x+a)/(x-1)=3 X趋向于1 求a lim x趋向于正无穷x(√1+x^2 -x )= 1.lim x趋向于无穷大sinx/x+1=? 2.lim x趋向于无穷大(1+2/x)^x+3=? lim x趋向无穷大 (1+2/x)^x=? lim|x趋向于0+ ln(1+2x^2)/x^2 = 2, lim(1-2/x)^2x=?x趋向于无穷 当x趋向于0时,求证lim（2x+1）/x-1=-1 lim(1-2x)1/x=?x趋向于无穷