求助，巨佬们救救我⑧

来个人⑧

http://tieba.baidu.com/p/7237281096?share=9105&fr=share&see_lz=0&share_from=post&sfc=copy&client_type=2&client_version=12.7.1.1&st=1627454347&unique=1D13CBD1DBBDAC48F514F08DEADB2A9A

没细看，不知道可否参考

不妨设x+y+z=1
通分：只需证((5∑(x^4)(y^2)+∑(x^6)+11(x^2)(y^2)(z^2))(x+y+z)/(4∑x^4)(y^2)(z^2)+∑(x^6)(y^2)+2∑(x^4)(y^4))≥12
而该不等式是显然的