算错了，这个边界肯定没有反例
本帖最后由 数学星空 于 2010-6-23 19:53 编辑
quote]算错了，这个边界肯定没有反例
mathe 发表于 2010-6-23 15:06 http://bbs.emath.ac.cn/images/common/back.gif
呵,
f := sqrt((a^k+b^k+c^k)*(1/a^k+1/b^k+1/c^k))
>g1 := subs(k = 2, a = 0.7832207464149386807291631345, b= 0.7832207464149386807291631345, c = 1, f)=3.080129867
> g2 := subs(k = 1, a = 0.7832207464149386807291631345, b = 0.7832207464149386807291631345, c = 1, f*(f-2)) =3.080132455