送交者: zhangqq 于 2016-04-05, 20:30:02:

• 正实数x+y+z=1,则sqrt(x+yz)+sqrt(y+zx)+sqrt(z+xy)<=2 (无内容) - zhangqq (0 bytes) 2016-04-05, 20:31:42 (805360)
  • 证明见内 - zhangqq (217 bytes) 2016-04-05, 20:36:33 (805361)

加跟贴