n,kn,kn,k 两个正整数，满足1n+n+1+1n+1+n+2+...1n+k+n+k+1=9\frac{1}{\sqrt{n}+\sqrt{n+1}}+\frac{1}{\sqrt{n+1}+\sqrt{n+2}}+...\frac{1}{\sqrt{n+k}+\sqrt{n+k+1}}=9n+n+11+n+1+n+21+...n+k+n+k+11=9
求 kkk 的最小值
