lim→无穷 3x^3+x-1/9x^3+2x^2+X 求极限

lim(x趋向于无穷)(1+3/x)^(x-3) lim x-无穷 (√3x^2+1)/x+1 lim(x趋向无穷)[1-(2/x)]^3x lim趋向正无穷(x+1/x)^3x lim趋向正无穷(x+1/x)^3x lim(x+1)^x+1(x+3)^x+3/x^2x+4 x趋于无穷 lim→无穷 3x^3+x-1/9x^3+2x^2+X 求极限 lim 3次√(x^3-5x^2+1)-x X→无穷 （9X^2+X）^(1/2)-3X lim X—>无穷 求limit lim x(√(9x^2+1) - 3x ) x趋于正无穷 关于极限1.lim((x^-1) + (x^-4))/((x^-2) - (x^-3)) x-> 正无穷2.lim ((e^x) - (e^-x))/((e^x) + (e^-x)) x-> 负无穷 lim x→正无穷 sin2x/3x =什么 lim（x->无穷）sinx-tanx/e^x^3-1 x趋近于无穷 lim [xsin(1/3x) ]=? 利用无穷小量,计算下列极限x-无穷,lim（2x^3-x-1）x-无穷,lim arctan x/x 求极限lim(1+2/x)^2x+3x→正无穷 求lim(x^2+2x)/(x^3-3x+2),x→无穷的极限 lim趋于无穷.(x+2/x+3)^2x