lim x区于2,2x^2-5x+2/x^2-x-2,求极限

lim（x趋向于4）(x^2-6x+8)/(x^2-5x+4) 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 lim(x趋向于0)(x*cotx-1)/(x^2) lim[(sin x)^tan x],x趋向于Pai/2 lim(1+3x)^(2/x)x趋向于零 lim(1-2x)^1/x x趋向于0 lim x区于2,2x^2-5x+2/x^2-x-2,求极限 lim(x^2-1)/(x^2-5x+4) x趋向于2 求极限 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-x)^(2/x) x->0 求极限,lim(x趋向于1)(x^2-2x+1)/(x^3-x) 求lim (sin^2x+x)/(cos^2x-x) x趋向于无穷 lim(x(sin)^2) 求极限lim （e^x）- (e^-x) -2x / (tanx-x) x趋向于0 lim(1-(5/x))^x-2 lim(1-2x)^(1/x)=?lim下面是X趋向于0 lim （x 趋向于无穷)e^-x^2*cosx