lim(x→0)[(1+x)/(1-x)]^1/2x

几道求极限的高数题,lim1/x(tanπx/(2x+1)) x→∞lim x(x^x-1)x→0+lim(x^x^x- lim(x→0)ln(1-2x)/x lim(x→0)(1-x^2-e^-x)/sinx 极限lim(x→0)(1-2/x)^x lim(x->0)((2-x)/(3-x))^1/x 求lim(x→0)x cos 1/x lim(x→∞)x^2/ (3x-1)的极限 lim(x→0)[(1+X)(1+2X)(1+3x)-1]/x lim x→0 (x^2+2x-1)/(x^3-2x)的极限是多少 lim (x→0) ［(2x) / (1+x^2)］/sec x tan x+si 求极限 （（sin(x^3+x^2-x)+sin x) /x x→0 已知lim sinx/x=1 数学极限lim(x→0)((x^3)/(3*x^2-1)) lim(x→+无穷)(√x(x+2)-√(x^2-x+1)) lim(x→0)(x/1-sinx/x+1)