求x趋于无穷,(x^3-1)/(x^2+2x+3)的极限如题

求2x^3-x+1趋于无穷的极限? 求x趋于无穷,(x^3-1)/(x^2+2x+3)的极限如题 当x趋于无穷时,求[(2x+3)/(2x-1)]^(x+4)的极限 求lim(x^3(sin1/x-1/2*sin2/x)) x趋于无穷 x趋于无穷时,(x/(x+1))^x求极限 求（x^5+x^2-x)/(x^4-2x-1)的极限x趋于无穷 limx趋于无穷[(x-1)/(x 3)](2x-1)的次方求极限 求极限limx趋于无穷(4×x的平方-2x+1)/(3x+2) lim(x+1)^x+1(x+3)^x+3/x^2x+4 x趋于无穷 求极限值,lim {(x^2-2x+4)/(x^2-3x-1)}^(2x-1)求解!(x趋于无穷) 求极限x^3*（cos x + sin x）/2^x,x趋于无穷 lim(x+1/x+2)^x=?x趋于无穷 lim(x趋于无穷)(x/1+x)^(x+2)=? 2*X^3-X+1在趋于无穷的极限怎么求?求过程 求lim[x趋于无穷]{(x^3)*ln[(x+1)/(x-1)]-2x^2},答案为2/3, 当x趋于正无穷时,求(x^3+2x^2-1)/(5x^2+x)的极限 求极限,lim(2x-1/2x+1)的3x-2的平方,x趋于无穷,求详解, 求极限 lim(3-2x/2-3x)^x ,x趋于无穷