1/2+1/6+1/18+1/54+1/162+1/486=?

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1/2+1/6+1/18+1/54+1/162+1/486=?1/2+1/6+1/18+1/54+1/162+1/486=?1/2+1/6+1/18+1/54+1/162+1/486=?设s=1/2+

1/2+1/6+1/18+1/54+1/162+1/486=?
1/2+1/6+1/18+1/54+1/162+1/486=?

1/2+1/6+1/18+1/54+1/162+1/486=?
设s=1/2+1/6+1/18+1/54+1/162+1/486
3s=3/2+1/2+1/6+1/18+1/54+1/162
3s-s=1-1/486
2s=485/486
s=485/972
1/2+1/6+1/18+1/54+1/162+1/486=485/972

243分之182

182/243

1/2+1/6+1/18+1/54+1/162+1/486
=(1+3+9+27+81+243)/486
=364/486

121/81

333/486=111/162