上下同时除以x^2，原式=lim(x→∞)(3-2/x-1/x^2)/(2-3/x+1/x^2)=(3-0-0)/(2-0+0)=3/2
lim (3x^2-2x-1)/(2x^2-3x+1)=lim (3x+1)(x-1) / (2x-1)(x-1)=lim (3x+1)/(2x-1)上下同时除以x=lim (3+1/x)/(2-1/x)=(3+0)/(2-0)=3/2有不懂欢迎追问
