lim[2n+(an^2-2n+1)/(bn+2)]=1,则点(a,b)坐标为

问题描述:

lim[2n+(an^2-2n+1)/(bn+2)]=1,则点(a,b)坐标为

(4,-2)
将式子2n+(an^2-2n+1)/(bn+2)]除n,取极限为0
得到a=-2b带入式子得到b=-2
得a=4