(1+1/2)×(1+1/4)×(1+1/6)×…×(1+1/10)×(1-1/3)×(1-1/5)×…×(1-1/9)

问题描述:

(1+

1
2
)×(1+
1
4
)×(1+
1
6
)×…×(1+
1
10
)×(1-
1
3
)×(1-
1
5
)×…×(1-
1
9

(1+12)×(1+14)×(1+16)×…×(1+110)×(1-13)×(1-15)×…×(1-19)=(32×54×76×…×1110)×(23×45×…×89)=(32×23)×(54×45)×(76×76)×…×(1110×1011)×(65×56)×…×(89...