急求lim(x趋向无穷)(2x-1/2x+3)^x-1

急求lim(x趋向无穷)(2x-1/2x+3)^x-1 lim(x趋向无穷)-(x+1)+√(x^2+1) lim(x趋向无穷)[1-(2/x)]^3x 【求极限】(x趋向正无穷)lim((x^2)/arctanx). 求lim x趋向于无穷时(-X)/(2X^2+3x-1)答案 lim(((x^2)/(1+x^2))^x）x趋向于无穷求大神详解 lim(x→-∞)x-2/(x+1)^2求详解!x趋向负无穷! lim(1-2/x)^x/2+1(x趋向于无穷)求极限 求lim（x趋向于无穷）（1-1/x^2)^x的极限 求lim x趋向于无穷{1+（1/2x)}^-x ? lim(1-3/x)^2x x趋向无穷求极限 lim 2x+1/x x趋向于无穷 求极限 求lim (sin^2x+x)/(cos^2x-x) x趋向于无穷 lim(x趋向无穷）(cos1/根号x)^2x 微积分求极限lim（x趋向无穷）(x2+(cosx)2-1)/(x+sinx)2= lim趋向正无穷(根号下X^2+X-1 -AX)=b ,求a ,b 题,求, lim(x趋向无穷) x^3+4x^2-5 / 2x^3-2x+1 =? 当x趋向于正无穷,求lim{{(x+1）^2*(3x-1)^3}/x^4*(x+4)}