一减三分之二减九分之二减二十七分之二减八十一分之二减二百四十三分之二减七百二十九分之二

2024-12-13 15:33:30
推荐回答(2个)
回答1:

1-(2/3)-(2/9)-(2/27)-(2/81)-(2/243)-(2/729)
=1-2*[(1/3)+(1/3^2)+(1/3^3)+(1/3^4)+(1/3^5)+(1/3^6)]
=1-2*[(1/3)-(1/3^6)×(1/3))]/[1-(1/3)]
=1-2*[(3^6)-1]/(2*3^6)
=1-[(3^6)-1]/(3^6)
=1-(3^6)/(3^6)+1/(3^6)
=1/729

回答2:

三十五除以八分之七乘一减七分之二