lim[2n+(an^2-2n+1)/(bn+2)]=1,则点(a,b)坐标为
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![lim[2n+(an^2-2n+1)/(bn+2)]=1,则点(a,b)坐标为](/uploads/image/z/10339757-53-7.jpg?t=lim%5B2n%2B%28an%5E2-2n%2B1%29%2F%28bn%2B2%29%5D%3D1%2C%E5%88%99%E7%82%B9%28a%2Cb%29%E5%9D%90%E6%A0%87%E4%B8%BA)
lim[2n+(an^2-2n+1)/(bn+2)]=1,则点(a,b)坐标为
lim[2n+(an^2-2n+1)/(bn+2)]=1,则点(a,b)坐标为
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
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