1.lim (e^1/x)/x^2 x趋向正无穷

求极限lim(e^3x-5x)^1/x x趋向于正无穷 lim(x趋向正无穷)[x]*sin(1\x)=? 【求极限】(x趋向正无穷)lim((x^2)/arctanx). 求极限.lim x(根号下(x^2+1) ) -x x趋向正无穷 lim （x 趋向于无穷)e^-x^2*cosx x趋向正无穷 lim[(x+a)/(x-a)]^x x趋向无穷时,求lim e^-x乘以(1+1/x)^(x^2),求方法, 高数求极限,lim(x趋向正无穷）cosx/(e^x+e^-x) Lim(x趋向正无穷)cosx/[e^x+e^(-x)]=? lim x趋向正无穷,[x+(1+x^2)^1/2]^/lnx 极限lim(x趋向正无穷) 3x^2+1 / 2x^2-2014 = lim(x趋向无穷)[1-(2/x)]^3x