求助一道数学题
  • 板块灌水区
  • 楼主_短笛无腔_
  • 当前回复3
  • 已保存回复3
  • 发布时间2021/4/4 07:57
  • 上次更新2023/11/5 01:04:32
查看原帖
求助一道数学题
254389
_短笛无腔_楼主2021/4/4 07:57

(111+121+131+141)×(121+131+141+151)−(111+121+131+141+151)×(121+131+141)(\frac{1}{11}+\frac{1}{21}+\frac{1}{31}+\frac{1}{41})\times(\frac{1}{21}+\frac{1}{31}+\frac{1}{41}+\frac{1}{51})-(\frac{1}{11}+\frac{1}{21}+\frac{1}{31}+\frac{1}{41}+\frac{1}{51})\times(\frac{1}{21}+\frac{1}{31}+\frac{1}{41})

2021/4/4 07:57